/*
* Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
* Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
* Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
* Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
* Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Linux for s390 port by D.J. Barrow
* <barrow_dj@mail.yahoo.com,djbarrow@de.ibm.com>
* Copyright (c) 1999-2021 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "defs.h"
#include <limits.h>
#include <fcntl.h>
#include <stdarg.h>
#include <sys/stat.h>
#include <sys/sysmacros.h>
#ifdef HAVE_SYS_XATTR_H
# include <sys/xattr.h>
#endif
#include <sys/uio.h>
#include "largefile_wrappers.h"
#include "number_set.h"
#include "print_fields.h"
#include "print_utils.h"
#include "secontext.h"
#include "static_assert.h"
#include "string_to_uint.h"
#include "xlat.h"
#include "xstring.h"
const struct xlat_data *
find_xlat_val_ex(const struct xlat_data *items, const char *s, size_t num_items,
unsigned int flags)
{
for (size_t i = 0; i < num_items; i++) {
if (!(flags & FXL_CASE_SENSITIVE ? strcmp
: strcasecmp)(items[i].str, s))
return items + i;
}
return NULL;
}
uint64_t
find_arg_val_(const char *arg, const struct xlat_data *strs, size_t strs_size,
uint64_t default_val, uint64_t not_found)
{
if (!arg)
return default_val;
const struct xlat_data *res = find_xlat_val_ex(strs, arg, strs_size, 0);
return res ? res->val : not_found;
}
int
str2timescale_ex(const char *arg, int empty_dflt, int null_dflt,
int *width)
{
static const struct xlat_data units[] = {
{ 1000000000U | (0ULL << 32), "s" },
{ 1000000U | (3ULL << 32), "ms" },
{ 1000U | (6ULL << 32), "us" },
{ 1U | (9ULL << 32), "ns" },
};
if (!arg)
return null_dflt;
if (!arg[0])
return empty_dflt;
uint64_t res = find_arg_val(arg, units, null_dflt, -1ULL);
if (width && res != -1ULL)
*width = res >> 32;
return res & 0xffffffff;
}
int
ts_nz(const struct timespec *a)
{
return a->tv_sec || a->tv_nsec;
}
int
ts_cmp(const struct timespec *a, const struct timespec *b)
{
if (a->tv_sec < b->tv_sec
|| (a->tv_sec == b->tv_sec && a->tv_nsec < b->tv_nsec))
return -1;
if (a->tv_sec > b->tv_sec
|| (a->tv_sec == b->tv_sec && a->tv_nsec > b->tv_nsec))
return 1;
return 0;
}
double
ts_float(const struct timespec *tv)
{
return tv->tv_sec + tv->tv_nsec/1000000000.0;
}
void
ts_add(struct timespec *tv, const struct timespec *a, const struct timespec *b)
{
tv->tv_sec = a->tv_sec + b->tv_sec;
tv->tv_nsec = a->tv_nsec + b->tv_nsec;
if (tv->tv_nsec >= 1000000000) {
tv->tv_sec++;
tv->tv_nsec -= 1000000000;
}
}
void
ts_sub(struct timespec *tv, const struct timespec *a, const struct timespec *b)
{
tv->tv_sec = a->tv_sec - b->tv_sec;
tv->tv_nsec = a->tv_nsec - b->tv_nsec;
if (tv->tv_nsec < 0) {
tv->tv_sec--;
tv->tv_nsec += 1000000000;
}
}
void
ts_div(struct timespec *tv, const struct timespec *a, uint64_t n)
{
long long nsec = (a->tv_sec % n * 1000000000LL + a->tv_nsec + n / 2) / n;
tv->tv_sec = a->tv_sec / n + nsec / 1000000000;
tv->tv_nsec = nsec % 1000000000;
}
void
ts_mul(struct timespec *tv, const struct timespec *a, uint64_t n)
{
long long nsec = a->tv_nsec * n;
tv->tv_sec = a->tv_sec * n + nsec / 1000000000;
tv->tv_nsec = nsec % 1000000000;
}
const struct timespec *
ts_min(const struct timespec *a, const struct timespec *b)
{
return ts_cmp(a, b) < 0 ? a : b;
}
const struct timespec *
ts_max(const struct timespec *a, const struct timespec *b)
{
return ts_cmp(a, b) > 0 ? a : b;
}
int
parse_ts(const char *s, struct timespec *t)
{
enum { NS_IN_S = 1000000000 };
static const char float_accept[] = "eE.-+0123456789";
static const char int_accept[] = "+0123456789";
size_t float_len = strspn(s, float_accept);
size_t int_len = strspn(s, int_accept);
char *endptr = NULL;
double float_val = -1;
long long int_val = -1;
if (float_len > int_len) {
errno = 0;
float_val = strtod(s, &endptr);
if (endptr == s || errno)
return -1;
if (float_val < 0)
return -1;
} else {
int_val = string_to_uint_ex(s, &endptr, LLONG_MAX, "smun");
if (int_val < 0)
return -1;
}
int scale = str2timescale_sfx(endptr, NULL);
if (scale <= 0)
return -1;
if (float_len > int_len) {
t->tv_sec = float_val / (NS_IN_S / scale);
t->tv_nsec = ((uint64_t) ((float_val -
(t->tv_sec * (NS_IN_S / scale)))
* scale)) % NS_IN_S;
} else {
t->tv_sec = int_val / (NS_IN_S / scale);
t->tv_nsec = (int_val % (NS_IN_S / scale)) * scale;
}
return 0;
}
#define ILOG10_ITER_(val_, div_, ret_, pow_) \
do { \
if ((val_) >= (div_)) { \
(val_) /= (div_); \
(ret_) += (pow_); \
} \
} while (0) \
/* End of ILOG10_ITER_ */
/* Returns 0 for 0. */
static int
ilog10(uint64_t val)
{
int ret = 0;
ILOG10_ITER_(val, 10000000000000000ULL, ret, 16);
ILOG10_ITER_(val, 100000000, ret, 8);
ILOG10_ITER_(val, 10000, ret, 4);
ILOG10_ITER_(val, 100, ret, 2);
ILOG10_ITER_(val, 10, ret, 1);
return ret;
}
void
print_clock_t(uint64_t val)
{
static long clk_tck;
static int frac_width;
if (!clk_tck) {
errno = 0;
clk_tck = sysconf(_SC_CLK_TCK);
if (clk_tck == -1 && errno)
debug_func_perror_msg("sysconf(_SC_CLK_TCK)");
if (clk_tck == 0)
clk_tck = -1;
if (clk_tck > 0)
frac_width = MIN(ilog10(clk_tck), 9);
}
PRINT_VAL_U(val);
if (xlat_verbose(xlat_verbosity) != XLAT_STYLE_RAW
&& clk_tck > 0 && val > 0) {
/*
* This dance here is due to the fact that this calculation
* may occasionally hit double precision limitations (52-bit
* mantissa) with large values of val.
*/
char buf[sizeof(uint64_t) * 3 + sizeof("0.0 s")];
size_t offs = ilog10(val / clk_tck);
int ret = snprintf(buf + offs, sizeof(buf) - offs, "%.*f s",
frac_width,
(double) (val % clk_tck) / clk_tck);
if (ret >= 0 && (unsigned) ret < sizeof(buf) - offs) {
snprintf(buf, offs + 2, "%" PRIu64, val / clk_tck);
buf[offs + 1] = '.';
tprints_comment(buf);
}
}
}
#if !defined HAVE_STPCPY
char *
stpcpy(char *dst, const char *src)
{
while ((*dst = *src++) != '\0')
dst++;
return dst;
}
#endif
/* Find a next bit which is set.
* Starts testing at cur_bit.
* Returns -1 if no more bits are set.
*
* We never touch bytes we don't need to.
* On big-endian, array is assumed to consist of
* current_wordsize wide words: for example, is current_wordsize is 4,
* the bytes are walked in 3,2,1,0, 7,6,5,4, 11,10,9,8 ... sequence.
* On little-endian machines, word size is immaterial.
*/
int
next_set_bit(const void *bit_array, unsigned cur_bit, unsigned size_bits)
{
const unsigned endian = 1;
int little_endian = *(char *) (void *) &endian;
const uint8_t *array = bit_array;
unsigned pos = cur_bit / 8;
unsigned pos_xor_mask = little_endian ? 0 : current_wordsize-1;
for (;;) {
uint8_t bitmask;
uint8_t cur_byte;
if (cur_bit >= size_bits)
return -1;
cur_byte = array[pos ^ pos_xor_mask];
if (cur_byte == 0) {
cur_bit = (cur_bit + 8) & (-8);
pos++;
continue;
}
bitmask = 1 << (cur_bit & 7);
for (;;) {
if (cur_byte & bitmask)
return cur_bit;
cur_bit++;
if (cur_bit >= size_bits)
return -1;
bitmask <<= 1;
/* This check *can't be* optimized out: */
if (bitmask == 0)
break;
}
pos++;
}
}
/*
* Fetch 64bit argument at position arg_no and
* return the index of the next argument.
*/
unsigned int
getllval(struct tcb *tcp, unsigned long long *val, unsigned int arg_no)
{
#if SIZEOF_KERNEL_LONG_T > 4
# ifndef current_klongsize
if (current_klongsize < SIZEOF_KERNEL_LONG_T) {
# if defined(AARCH64) || defined(POWERPC64) || defined(POWERPC64LE)
/* Align arg_no to the next even number. */
arg_no = (arg_no + 1) & 0xe;
# endif /* AARCH64 || POWERPC64 || POWERPC64LE */
*val = ULONG_LONG(tcp->u_arg[arg_no], tcp->u_arg[arg_no + 1]);
arg_no += 2;
} else
# endif /* !current_klongsize */
{
*val = tcp->u_arg[arg_no];
arg_no++;
}
#else /* SIZEOF_KERNEL_LONG_T == 4 */
# if defined __ARM_EABI__ \
|| defined LINUX_MIPSO32 \
|| defined POWERPC \
|| defined XTENSA
/* Align arg_no to the next even number. */
arg_no = (arg_no + 1) & 0xe;
# elif defined SH
/*
* The SH4 ABI does allow long longs in odd-numbered registers, but
* does not allow them to be split between registers and memory - and
* there are only four argument registers for normal functions. As a
* result, pread, for example, takes an extra padding argument before
* the offset. This was changed late in the 2.4 series (around 2.4.20).
*/
if (arg_no == 3)
arg_no++;
# endif /* __ARM_EABI__ || LINUX_MIPSO32 || POWERPC || XTENSA || SH */
*val = ULONG_LONG(tcp->u_arg[arg_no], tcp->u_arg[arg_no + 1]);
arg_no += 2;
#endif
return arg_no;
}
/*
* Print 64bit argument at position arg_no as a signed long long
* and return the index of the next argument.
*/
unsigned int
print_arg_lld(struct tcb *tcp, unsigned int arg_no)
{
unsigned long long val = 0;
arg_no = getllval(tcp, &val, arg_no);
PRINT_VAL_D(val);
return arg_no;
}
/*
* Print 64bit argument at position arg_no as an unsigned long long
* and return the index of the next argument.
*/
unsigned int
print_arg_llu(struct tcb *tcp, unsigned int arg_no)
{
unsigned long long val = 0;
arg_no = getllval(tcp, &val, arg_no);
PRINT_VAL_U(val);
return arg_no;
}
void
printaddr64(const uint64_t addr)
{
if (!addr)
tprints("NULL");
else
PRINT_VAL_X(addr);
}
#define DEF_PRINTNUM(name, type) \
bool \
printnum_ ## name(struct tcb *const tcp, const kernel_ulong_t addr, \
const char *const fmt) \
{ \
type num; \
if (umove_or_printaddr(tcp, addr, &num)) \
return false; \
tprint_indirect_begin(); \
tprintf(fmt, num); \
tprint_indirect_end(); \
return true; \
}
#define DEF_PRINTNUM_ADDR(name, type) \
bool \
printnum_addr_ ## name(struct tcb *tcp, const kernel_ulong_t addr) \
{ \
type num; \
if (umove_or_printaddr(tcp, addr, &num)) \
return false; \
tprint_indirect_begin(); \
printaddr64(num); \
tprint_indirect_end(); \
return true; \
}
#define DEF_PRINTPAIR(name, type) \
bool \
printpair_ ## name(struct tcb *const tcp, const kernel_ulong_t addr, \
const char *const fmt) \
{ \
type pair[2]; \
if (umove_or_printaddr(tcp, addr, &pair)) \
return false; \
tprint_array_begin(); \
tprintf(fmt, pair[0]); \
tprint_array_next(); \
tprintf(fmt, pair[1]); \
tprint_array_end(); \
return true; \
}
DEF_PRINTNUM(int, int)
DEF_PRINTNUM_ADDR(int, unsigned int)
DEF_PRINTPAIR(int, int)
DEF_PRINTNUM(short, short)
DEF_PRINTNUM(int64, uint64_t)
DEF_PRINTNUM_ADDR(int64, uint64_t)
DEF_PRINTPAIR(int64, uint64_t)
bool
printnum_fd(struct tcb *const tcp, const kernel_ulong_t addr)
{
int fd;
if (umove_or_printaddr(tcp, addr, &fd))
return false;
tprint_indirect_begin();
printfd(tcp, fd);
tprint_indirect_end();
return true;
}
bool
printnum_pid(struct tcb *const tcp, const kernel_ulong_t addr, enum pid_type type)
{
int pid;
if (umove_or_printaddr(tcp, addr, &pid))
return false;
tprint_indirect_begin();
printpid(tcp, pid, type);
tprint_indirect_end();
return true;
}
/**
* Prints time to a (static internal) buffer and returns pointer to it.
* Returns NULL if the provided time specification is not correct.
*
* @param sec Seconds since epoch.
* @param part_sec Amount of second parts since the start of a second.
* @param max_part_sec Maximum value of a valid part_sec.
* @param width 1 + floor(log10(max_part_sec)).
* @return Pointer to a statically allocated string on success,
* NULL on error.
*/
static const char *
sprinttime_ex(const long long sec, const unsigned long long part_sec,
const unsigned int max_part_sec, const int width)
{
static char buf[sizeof(int) * 3 * 6 + sizeof(part_sec) * 3
+ sizeof("+0000")];
if ((sec == 0 && part_sec == 0) || part_sec > max_part_sec)
return NULL;
time_t t = (time_t) sec;
struct tm *tmp = (sec == t) ? localtime(&t) : NULL;
if (!tmp)
return NULL;
size_t pos = strftime(buf, sizeof(buf), "%FT%T", tmp);
if (!pos)
return NULL;
if (part_sec > 0)
pos += xsnprintf(buf + pos, sizeof(buf) - pos, ".%0*llu",
width, part_sec);
return strftime(buf + pos, sizeof(buf) - pos, "%z", tmp) ? buf : NULL;
}
const char *
sprinttime(long long sec)
{
return sprinttime_ex(sec, 0, 0, 0);
}
const char *
sprinttime_usec(long long sec, unsigned long long usec)
{
return sprinttime_ex(sec, usec, 999999, 6);
}
const char *
sprinttime_nsec(long long sec, unsigned long long nsec)
{
return sprinttime_ex(sec, nsec, 999999999, 9);
}
void
print_uuid(const unsigned char *uuid)
{
const char str[] = {
BYTE_HEX_CHARS(uuid[0]),
BYTE_HEX_CHARS(uuid[1]),
BYTE_HEX_CHARS(uuid[2]),
BYTE_HEX_CHARS(uuid[3]),
'-',
BYTE_HEX_CHARS(uuid[4]),
BYTE_HEX_CHARS(uuid[5]),
'-',
BYTE_HEX_CHARS(uuid[6]),
BYTE_HEX_CHARS(uuid[7]),
'-',
BYTE_HEX_CHARS(uuid[8]),
BYTE_HEX_CHARS(uuid[9]),
'-',
BYTE_HEX_CHARS(uuid[10]),
BYTE_HEX_CHARS(uuid[11]),
BYTE_HEX_CHARS(uuid[12]),
BYTE_HEX_CHARS(uuid[13]),
BYTE_HEX_CHARS(uuid[14]),
BYTE_HEX_CHARS(uuid[15]),
'\0'
};
tprints(str);
}
enum sock_proto
getfdproto(struct tcb *tcp, int fd)
{
#ifdef HAVE_SYS_XATTR_H
size_t bufsize = 256;
char buf[bufsize];
ssize_t r;
char path[sizeof("/proc/%u/fd/%u") + 2 * sizeof(int)*3];
if (fd < 0)
return SOCK_PROTO_UNKNOWN;
xsprintf(path, "/proc/%u/fd/%u", get_proc_pid(tcp->pid), fd);
r = getxattr(path, "system.sockprotoname", buf, bufsize - 1);
if (r <= 0)
return SOCK_PROTO_UNKNOWN;
else {
/*
* This is a protection for the case when the kernel
* side does not append a null byte to the buffer.
*/
buf[r] = '\0';
return get_proto_by_name(buf);
}
#else
return SOCK_PROTO_UNKNOWN;
#endif
}
unsigned long
getfdinode(struct tcb *tcp, int fd)
{
char path[PATH_MAX + 1];
if (getfdpath(tcp, fd, path, sizeof(path)) >= 0) {
const char *str = STR_STRIP_PREFIX(path, "socket:[");
if (str != path) {
const size_t str_len = strlen(str);
if (str_len && str[str_len - 1] == ']')
return strtoul(str, NULL, 10);
}
}
return 0;
}
static bool
printsocket(struct tcb *tcp, int fd, const char *path)
{
const char *str = STR_STRIP_PREFIX(path, "socket:[");
size_t len;
unsigned long inode;
const char *details = NULL;
if ((str != path)
&& (len = strlen(str))
&& (str[len - 1] == ']')
&& (inode = strtoul(str, NULL, 10)))
details = get_sockaddr_by_inode(tcp, fd, inode);
if (details) {
tprints("<");
tprints(details);
tprints(">");
return true;
}
return false;
}
static bool
printdev(struct tcb *tcp, int fd, const char *path)
{
strace_stat_t st;
if (path[0] != '/')
return false;
if (stat_file(path, &st)) {
debug_func_perror_msg("stat(\"%s\")", path);
return false;
}
switch (st.st_mode & S_IFMT) {
case S_IFBLK:
case S_IFCHR:
tprints("<");
print_quoted_string_ex(path, strlen(path),
QUOTE_OMIT_LEADING_TRAILING_QUOTES,
"<>");
tprintf("<%s %u:%u>>",
S_ISBLK(st.st_mode)? "block" : "char",
major(st.st_rdev), minor(st.st_rdev));
return true;
}
return false;
}
pid_t
pidfd_get_pid(pid_t pid_of_fd, int fd)
{
int proc_pid = 0;
translate_pid(NULL, pid_of_fd, PT_TID, &proc_pid);
if (!proc_pid)
return -1;
char fdi_path[sizeof("/proc/%u/fdinfo/%u") + 2 * sizeof(int) * 3];
xsprintf(fdi_path, "/proc/%u/fdinfo/%u", proc_pid, fd);
FILE *f = fopen_stream(fdi_path, "r");
if (!f)
return -1;
static const char pid_pfx[] = "Pid:\t";
char *line = NULL;
size_t sz = 0;
pid_t pid = -1;
while (getline(&line, &sz, f) > 0) {
const char *pos = STR_STRIP_PREFIX(line, pid_pfx);
if (pos == line)
continue;
pid = string_to_uint_ex(pos, NULL, INT_MAX, "\n");
break;
}
free(line);
fclose(f);
return pid;
}
static bool
printpidfd(pid_t pid_of_fd, int fd, const char *path)
{
static const char pidfd_path[] = "anon_inode:[pidfd]";
if (strcmp(path, pidfd_path))
return false;
pid_t pid = pidfd_get_pid(pid_of_fd, fd);
if (pid <= 0)
return false;
tprints("<pid:");
/*
* The pid translation is not needed because
* the pid is in strace's namespace.
*/
printpid(NULL, pid, PT_TID);
tprints(">");
return true;
}
static void
print_quoted_string_in_angle_brackets(const char *str)
{
tprints("<");
print_quoted_string_ex(str, strlen(str),
QUOTE_OMIT_LEADING_TRAILING_QUOTES, "<>");
tprints(">");
}
void
printfd_pid(struct tcb *tcp, pid_t pid, int fd)
{
PRINT_VAL_D(fd);
char path[PATH_MAX + 1];
if (pid > 0 && !number_set_array_is_empty(decode_fd_set, 0)
&& getfdpath_pid(pid, fd, path, sizeof(path)) >= 0) {
if (is_number_in_set(DECODE_FD_SOCKET, decode_fd_set) &&
printsocket(tcp, fd, path))
goto printed;
if (is_number_in_set(DECODE_FD_DEV, decode_fd_set) &&
printdev(tcp, fd, path))
goto printed;
if (is_number_in_set(DECODE_FD_PIDFD, decode_fd_set) &&
printpidfd(pid, fd, path))
goto printed;
if (is_number_in_set(DECODE_FD_PATH, decode_fd_set))
print_quoted_string_in_angle_brackets(path);
printed: ;
}
#ifdef ENABLE_SECONTEXT
char *context;
if (!selinux_getfdcon(pid, fd, &context)) {
tprintf(" [%s]", context);
free(context);
}
#endif
}
void
printfd_pid_tracee_ns(struct tcb *tcp, pid_t pid, int fd)
{
int strace_pid = translate_pid(tcp, pid, PT_TGID, NULL);
printfd_pid(tcp, strace_pid, fd);
}
const char *
pid_to_str(pid_t pid)
{
if (!pid)
return "self";
static char buf[sizeof("-2147483648")];
xsprintf(buf, "%d", pid);
return buf;
}
size_t
proc_status_get_id_list(int proc_pid, int *id_buf, size_t id_buf_size,
const char *str, size_t str_size)
{
size_t n = 0;
if (!str_size)
str_size = strlen(str);
char status_path[PATH_MAX + 1];
xsprintf(status_path, "/proc/%s/status", pid_to_str(proc_pid));
FILE *f = fopen_stream(status_path, "r");
if (!f)
return 0;
char *line = NULL;
size_t linesize = 0;
char *p = NULL;
while (getline(&line, &linesize, f) > 0) {
if (strncmp(line, str, str_size) == 0) {
p = line + str_size;
break;
}
}
while (p) {
errno = 0;
long id = strtol(p, NULL, 10);
if (id < 0 || id > INT_MAX || errno) {
debug_func_perror_msg("converting \"%s\" to int", p);
break;
}
if (id_buf && n < id_buf_size)
id_buf[n] = (int) id;
n++;
strsep(&p, "\t");
}
free(line);
fclose(f);
return n;
}
/*
* Quote string `instr' of length `size'
* Write up to (3 + `size' * 4) bytes to `outstr' buffer.
*
* `escape_chars' specifies characters (in addition to characters with
* codes 0..31, 127..255, single and double quotes) that should be escaped.
*
* If QUOTE_0_TERMINATED `style' flag is set,
* treat `instr' as a NUL-terminated string,
* checking up to (`size' + 1) bytes of `instr'.
*
* If QUOTE_OMIT_LEADING_TRAILING_QUOTES `style' flag is set,
* do not add leading and trailing quoting symbols.
*
* Returns 0 if QUOTE_0_TERMINATED is set and NUL was seen, 1 otherwise.
* Note that if QUOTE_0_TERMINATED is not set, always returns 1.
*/
int
string_quote(const char *instr, char *outstr, const unsigned int size,
const unsigned int style, const char *escape_chars)
{
const unsigned char *ustr = (const unsigned char *) instr;
char *s = outstr;
unsigned int i;
int usehex, c, eol;
bool printable;
if (style & QUOTE_0_TERMINATED)
eol = '\0';
else
eol = 0x100; /* this can never match a char */
usehex = 0;
if ((xflag == HEXSTR_ALL) || (style & QUOTE_FORCE_HEX)) {
usehex = 1;
} else if (xflag == HEXSTR_NON_ASCII) {
/* Check for presence of symbol which require
to hex-quote the whole string. */
for (i = 0; i < size; ++i) {
c = ustr[i];
/* Check for NUL-terminated string. */
if (c == eol)
break;
/* Force hex unless c is printable or whitespace */
if (c > 0x7e) {
usehex = 1;
break;
}
/* In ASCII isspace is only these chars: "\t\n\v\f\r".
* They happen to have ASCII codes 9,10,11,12,13.
*/
if (c < ' ' && (unsigned)(c - 9) >= 5) {
usehex = 1;
break;
}
}
}
if (style & QUOTE_EMIT_COMMENT)
s = stpcpy(s, " /* ");
if (!(style & QUOTE_OMIT_LEADING_TRAILING_QUOTES))
*s++ = '\"';
if (usehex) {
/* Hex-quote the whole string. */
for (i = 0; i < size; ++i) {
c = ustr[i];
/* Check for NUL-terminated string. */
if (c == eol)
goto asciz_ended;
*s++ = '\\';
*s++ = 'x';
s = sprint_byte_hex(s, c);
}
goto string_ended;
}
for (i = 0; i < size; ++i) {
c = ustr[i];
/* Check for NUL-terminated string. */
if (c == eol)
goto asciz_ended;
if ((i == (size - 1)) &&
(style & QUOTE_OMIT_TRAILING_0) && (c == '\0'))
goto asciz_ended;
switch (c) {
case '\"': case '\\':
*s++ = '\\';
*s++ = c;
break;
case '\f':
*s++ = '\\';
*s++ = 'f';
break;
case '\n':
*s++ = '\\';
*s++ = 'n';
break;
case '\r':
*s++ = '\\';
*s++ = 'r';
break;
case '\t':
*s++ = '\\';
*s++ = 't';
break;
case '\v':
*s++ = '\\';
*s++ = 'v';
break;
default:
printable = is_print(c);
if (printable && escape_chars)
printable = !strchr(escape_chars, c);
if (printable) {
*s++ = c;
} else {
if (xflag == HEXSTR_NON_ASCII_CHARS) {
/* Print he\x */
*s++ = '\\';
*s++ = 'x';
s = sprint_byte_hex(s, c);
} else {
/* Print \octal */
*s++ = '\\';
s = sprint_byte_oct(s, c,
i + 1 < size
&& ustr[i + 1] >= '0'
&& ustr[i + 1] <= '7');
}
}
}
}
string_ended:
if (!(style & QUOTE_OMIT_LEADING_TRAILING_QUOTES))
*s++ = '\"';
if (style & QUOTE_EMIT_COMMENT)
s = stpcpy(s, " */");
*s = '\0';
/* Return zero if we printed entire ASCIZ string (didn't truncate it) */
if (style & QUOTE_0_TERMINATED && ustr[i] == '\0') {
/* We didn't see NUL yet (otherwise we'd jump to 'asciz_ended')
* but next char is NUL.
*/
return 0;
}
return 1;
asciz_ended:
if (!(style & QUOTE_OMIT_LEADING_TRAILING_QUOTES))
*s++ = '\"';
if (style & QUOTE_EMIT_COMMENT)
s = stpcpy(s, " */");
*s = '\0';
/* Return zero: we printed entire ASCIZ string (didn't truncate it) */
return 0;
}
#ifndef ALLOCA_CUTOFF
# define ALLOCA_CUTOFF 4032
#endif
#define use_alloca(n) ((n) <= ALLOCA_CUTOFF)
/*
* Quote string `str' of length `size' and print the result.
*
* If QUOTE_0_TERMINATED `style' flag is set,
* treat `str' as a NUL-terminated string and
* quote at most (`size' - 1) bytes.
*
* If QUOTE_OMIT_LEADING_TRAILING_QUOTES `style' flag is set,
* do not add leading and trailing quoting symbols.
*
* Returns 0 if QUOTE_0_TERMINATED is set and NUL was seen, 1 otherwise.
* Note that if QUOTE_0_TERMINATED is not set, always returns 1.
*/
int
print_quoted_string_ex(const char *str, unsigned int size,
const unsigned int style, const char *escape_chars)
{
char *buf;
char *outstr;
unsigned int alloc_size;
int rc;
if (size && style & QUOTE_0_TERMINATED)
--size;
alloc_size = 4 * size;
if (alloc_size / 4 != size) {
error_func_msg("requested %u bytes exceeds %u bytes limit",
size, -1U / 4);
tprint_unavailable();
return -1;
}
alloc_size += 1 + (style & QUOTE_OMIT_LEADING_TRAILING_QUOTES ? 0 : 2) +
(style & QUOTE_EMIT_COMMENT ? 7 : 0);
if (use_alloca(alloc_size)) {
outstr = alloca(alloc_size);
buf = NULL;
} else {
outstr = buf = malloc(alloc_size);
if (!buf) {
error_func_msg("memory exhausted when tried to allocate"
" %u bytes", alloc_size);
tprint_unavailable();
return -1;
}
}
rc = string_quote(str, outstr, size, style, escape_chars);
tprints(outstr);
if (((style & (QUOTE_0_TERMINATED | QUOTE_EXPECT_TRAILING_0))
== (QUOTE_0_TERMINATED | QUOTE_EXPECT_TRAILING_0)) && rc) {
tprint_more_data_follows();
}
free(buf);
return rc;
}
inline int
print_quoted_string(const char *str, unsigned int size,
const unsigned int style)
{
return print_quoted_string_ex(str, size, style, NULL);
}
/*
* Quote a NUL-terminated string `str' of length up to `size' - 1
* and print the result.
*
* Returns 0 if NUL was seen, 1 otherwise.
*/
int
print_quoted_cstring(const char *str, unsigned int size)
{
int unterminated =
print_quoted_string(str, size, QUOTE_0_TERMINATED);
if (unterminated)
tprint_more_data_follows();
return unterminated;
}
/*
* Print path string specified by address `addr' and length `n'.
* If path length exceeds `n', append `...' to the output.
*
* Returns the result of umovenstr.
*/
int
printpathn(struct tcb *const tcp, const kernel_ulong_t addr, unsigned int n)
{
char path[PATH_MAX];
int nul_seen;
if (!addr) {
tprints("NULL");
return -1;
}
/* Cap path length to the path buffer size */
if (n > sizeof(path) - 1)
n = sizeof(path) - 1;
/* Fetch one byte more to find out whether path length > n. */
nul_seen = umovestr(tcp, addr, n + 1, path);
if (nul_seen < 0)
printaddr(addr);
else {
path[n++] = !nul_seen;
print_quoted_cstring(path, n);
#ifdef ENABLE_SECONTEXT
char *context;
if (nul_seen && !selinux_getfilecon(tcp, path, &context)) {
tprintf(" [%s]", context);
free(context);
}
#endif
}
return nul_seen;
}
int
printpath(struct tcb *const tcp, const kernel_ulong_t addr)
{
/* Size must correspond to char path[] size in printpathn */
return printpathn(tcp, addr, PATH_MAX - 1);
}
/*
* Print string specified by address `addr' and length `len'.
* If `user_style' has QUOTE_0_TERMINATED bit set, treat the string
* as a NUL-terminated string.
* Pass `user_style' on to `string_quote'.
* Append `...' to the output if either the string length exceeds `max_strlen',
* or QUOTE_0_TERMINATED bit is set and the string length exceeds `len'.
*
* Returns the result of umovenstr if style has QUOTE_0_TERMINATED,
* or the result of umoven otherwise.
*/
int
printstr_ex(struct tcb *const tcp, const kernel_ulong_t addr,
const kernel_ulong_t len, const unsigned int user_style)
{
static char *str;
static char *outstr;
unsigned int size;
unsigned int style = user_style;
int rc;
int ellipsis;
if (!addr) {
tprints("NULL");
return -1;
}
/* Allocate static buffers if they are not allocated yet. */
if (!str) {
const unsigned int outstr_size =
4 * max_strlen + /* for quotes and NUL */ 3;
/*
* We can assume that outstr_size / 4 == max_strlen
* since we have a guarantee that max_strlen <= -1U / 4.
*/
str = xmalloc(max_strlen + 1);
outstr = xmalloc(outstr_size);
}
/* Fetch one byte more because string_quote may look one byte ahead. */
size = max_strlen + 1;
if (size > len)
size = len;
if (style & QUOTE_0_TERMINATED)
rc = umovestr(tcp, addr, size, str);
else
rc = umoven(tcp, addr, size, str);
if (rc < 0) {
printaddr(addr);
return rc;
}
if (size > max_strlen)
size = max_strlen;
else
str[size] = '\xff';
if ((style & (QUOTE_0_TERMINATED | QUOTE_EXPECT_TRAILING_0))
== (QUOTE_0_TERMINATED | QUOTE_EXPECT_TRAILING_0)
&& size == len && size) {
--size;
}
/* If string_quote didn't see NUL and (it was supposed to be ASCIZ str
* or we were requested to print more than -s NUM chars)...
*/
ellipsis = string_quote(str, outstr, size, style, NULL)
&& len
&& ((style & (QUOTE_0_TERMINATED | QUOTE_EXPECT_TRAILING_0))
|| len > max_strlen);
tprints(outstr);
if (ellipsis)
tprint_more_data_follows();
return rc;
}
bool
print_nonzero_bytes(struct tcb *const tcp,
void (*const prefix_fun)(void),
const kernel_ulong_t start_addr,
const unsigned int start_offs,
const unsigned int total_len,
const unsigned int style)
{
if (start_offs >= total_len)
return false;
const kernel_ulong_t addr = start_addr + start_offs;
const unsigned int len = total_len - start_offs;
const unsigned int size = MIN(len, max_strlen);
char *str = malloc(len);
if (!str) {
error_func_msg("memory exhausted when tried to allocate"
" %u bytes", len);
prefix_fun();
tprint_unavailable();
return true;
}
bool ret = true;
if (umoven(tcp, addr, len, str)) {
prefix_fun();
tprint_unavailable();
} else if (is_filled(str, 0, len)) {
ret = false;
} else {
prefix_fun();
tprintf("/* bytes %u..%u */ ", start_offs, total_len - 1);
print_quoted_string(str, size, style);
if (size < len)
tprint_more_data_follows();
}
free(str);
return ret;
}
void
dumpiov_upto(struct tcb *const tcp, const int len, const kernel_ulong_t addr,
kernel_ulong_t data_size)
{
#if ANY_WORDSIZE_LESS_THAN_KERNEL_LONG
union {
struct { uint32_t base; uint32_t len; } *iov32;
struct { uint64_t base; uint64_t len; } *iov64;
} iovu;
# define iov iovu.iov64
# define sizeof_iov \
(current_wordsize == 4 ? (unsigned int) sizeof(*iovu.iov32) \
: (unsigned int) sizeof(*iovu.iov64))
# define iov_iov_base(i) \
(current_wordsize == 4 ? (uint64_t) iovu.iov32[i].base : iovu.iov64[i].base)
# define iov_iov_len(i) \
(current_wordsize == 4 ? (uint64_t) iovu.iov32[i].len : iovu.iov64[i].len)
#else
struct iovec *iov;
# define sizeof_iov ((unsigned int) sizeof(*iov))
# define iov_iov_base(i) ptr_to_kulong(iov[i].iov_base)
# define iov_iov_len(i) iov[i].iov_len
#endif
unsigned int size = sizeof_iov * len;
if (size / sizeof_iov != (unsigned int) len) {
error_func_msg("requested %u iovec elements exceeds"
" %u iovec limit", len, -1U / sizeof_iov);
return;
}
iov = malloc(size);
if (!iov) {
error_func_msg("memory exhausted when tried to allocate"
" %u bytes", size);
return;
}
if (umoven(tcp, addr, size, iov) >= 0) {
for (int i = 0; i < len; ++i) {
kernel_ulong_t iov_len = iov_iov_len(i);
if (iov_len > data_size)
iov_len = data_size;
if (!iov_len)
break;
data_size -= iov_len;
/* include the buffer number to make it easy to
* match up the trace with the source */
tprintf(" * %" PRI_klu " bytes in buffer %d\n", iov_len, i);
dumpstr(tcp, iov_iov_base(i), iov_len);
}
}
free(iov);
#undef sizeof_iov
#undef iov_iov_base
#undef iov_iov_len
#undef iov
}
void
dumpstr(struct tcb *const tcp, const kernel_ulong_t addr,
const kernel_ulong_t len)
{
/* xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx 1234567890123456 */
enum {
HEX_BIT = 4,
DUMPSTR_GROUP_BYTES = 8,
DUMPSTR_GROUPS = 2,
DUMPSTR_WIDTH_BYTES = DUMPSTR_GROUP_BYTES * DUMPSTR_GROUPS,
/** Width of formatted dump in characters. */
DUMPSTR_WIDTH_CHARS = DUMPSTR_WIDTH_BYTES +
sizeof("xx") * DUMPSTR_WIDTH_BYTES + DUMPSTR_GROUPS,
DUMPSTR_GROUP_MASK = DUMPSTR_GROUP_BYTES - 1,
DUMPSTR_BYTES_MASK = DUMPSTR_WIDTH_BYTES - 1,
/** Minimal width of the offset field in the output. */
DUMPSTR_OFFS_MIN_CHARS = 5,
/** Arbitrarily chosen internal dumpstr buffer limit. */
DUMPSTR_BUF_MAXSZ = 1 << 16,
};
static_assert(!(DUMPSTR_BUF_MAXSZ % DUMPSTR_WIDTH_BYTES),
"Maximum internal buffer size should be divisible "
"by amount of bytes dumped per line");
static_assert(!(DUMPSTR_GROUP_BYTES & DUMPSTR_GROUP_MASK),
"DUMPSTR_GROUP_BYTES is not power of 2");
static_assert(!(DUMPSTR_WIDTH_BYTES & DUMPSTR_BYTES_MASK),
"DUMPSTR_WIDTH_BYTES is not power of 2");
if (len > len + DUMPSTR_WIDTH_BYTES || addr + len < addr) {
debug_func_msg("len %" PRI_klu " at addr %#" PRI_klx
" is too big, skipped", len, addr);
return;
}
static kernel_ulong_t strsize;
static unsigned char *str;
const kernel_ulong_t alloc_size =
MIN(ROUNDUP(len, DUMPSTR_WIDTH_BYTES), DUMPSTR_BUF_MAXSZ);
if (strsize < alloc_size) {
free(str);
str = malloc(alloc_size);
if (!str) {
strsize = 0;
error_func_msg("memory exhausted when tried to allocate"
" %" PRI_klu " bytes", alloc_size);
return;
}
strsize = alloc_size;
}
/**
* Characters needed in order to print the offset field. We calculate
* it this way in order to avoid ilog2_64 call most of the time.
*/
const int offs_chars = len > (1 << (DUMPSTR_OFFS_MIN_CHARS * HEX_BIT))
? 1 + ilog2_klong(len - 1) / HEX_BIT : DUMPSTR_OFFS_MIN_CHARS;
kernel_ulong_t i = 0;
const unsigned char *src;
while (i < len) {
/*
* It is important to overwrite all the byte values, as we
* re-use the buffer in order to avoid its re-initialisation.
*/
static char outbuf[] = {
[0 ... DUMPSTR_WIDTH_CHARS - 1] = ' ',
'\0'
};
char *dst = outbuf;
/* Fetching data from tracee. */
if (!i || (i % DUMPSTR_BUF_MAXSZ) == 0) {
kernel_ulong_t fetch_size = MIN(len - i, alloc_size);
if (umoven(tcp, addr + i, fetch_size, str) < 0) {
/*
* Don't silently abort if we have printed
* something already.
*/
if (i)
tprintf(" | <Cannot fetch %" PRI_klu
" byte%s from pid %d"
" @%#" PRI_klx ">\n",
fetch_size,
fetch_size == 1 ? "" : "s",
tcp->pid, addr + i);
return;
}
src = str;
}
/* hex dump */
do {
if (i < len) {
dst = sprint_byte_hex(dst, *src);
} else {
*dst++ = ' ';
*dst++ = ' ';
}
dst++; /* space is there */
i++;
if ((i & DUMPSTR_GROUP_MASK) == 0)
dst++; /* space is there */
src++;
} while (i & DUMPSTR_BYTES_MASK);
/* ASCII dump */
i -= DUMPSTR_WIDTH_BYTES;
src -= DUMPSTR_WIDTH_BYTES;
do {
if (i < len) {
if (is_print(*src))
*dst++ = *src;
else
*dst++ = '.';
} else {
*dst++ = ' ';
}
src++;
} while (++i & DUMPSTR_BYTES_MASK);
tprintf(" | %0*" PRI_klx " %s |\n",
offs_chars, i - DUMPSTR_WIDTH_BYTES, outbuf);
}
}
bool
tfetch_mem64(struct tcb *const tcp, const uint64_t addr,
const unsigned int len, void *const our_addr)
{
return addr && verbose(tcp) &&
(entering(tcp) || !syserror(tcp)) &&
!umoven(tcp, addr, len, our_addr);
}
bool
tfetch_mem64_ignore_syserror(struct tcb *const tcp, const uint64_t addr,
const unsigned int len, void *const our_addr)
{
return addr && verbose(tcp) &&
!umoven(tcp, addr, len, our_addr);
}
int
umoven_or_printaddr64(struct tcb *const tcp, const uint64_t addr,
const unsigned int len, void *const our_addr)
{
if (tfetch_mem64(tcp, addr, len, our_addr))
return 0;
printaddr64(addr);
return -1;
}
int
umoven_or_printaddr64_ignore_syserror(struct tcb *const tcp,
const uint64_t addr,
const unsigned int len,
void *const our_addr)
{
if (tfetch_mem64_ignore_syserror(tcp, addr, len, our_addr))
return 0;
printaddr64(addr);
return -1;
}
int
umoven_to_uint64_or_printaddr64(struct tcb *const tcp, const uint64_t addr,
unsigned int len, uint64_t *const our_addr)
{
union {
uint64_t val;
uint8_t bytes[sizeof(uint64_t)];
} data = { .val = 0 };
const size_t offs = is_bigendian ? sizeof(data) - len : 0;
if (len <= sizeof(data) &&
tfetch_mem64_ignore_syserror(tcp, addr, len, data.bytes + offs)) {
*our_addr = data.val;
return 0;
}
printaddr64(addr);
return -1;
}
bool
print_int_array_member(struct tcb *tcp, void *elem_buf, size_t elem_size,
void *data)
{
switch (elem_size) {
case sizeof(int8_t): PRINT_VAL_D(*(int8_t *) elem_buf); break;
case sizeof(int16_t): PRINT_VAL_D(*(int16_t *) elem_buf); break;
case sizeof(int32_t): PRINT_VAL_D(*(int32_t *) elem_buf); break;
case sizeof(int64_t): PRINT_VAL_D(*(int64_t *) elem_buf); break;
default:
error_func_msg("Unexpected elem_size: %zu", elem_size);
return false;
}
return true;
}
bool
print_uint_array_member(struct tcb *tcp, void *elem_buf, size_t elem_size,
void *data)
{
switch (elem_size) {
case sizeof(uint8_t): PRINT_VAL_U(*(uint8_t *) elem_buf); break;
case sizeof(uint16_t): PRINT_VAL_U(*(uint16_t *) elem_buf); break;
case sizeof(uint32_t): PRINT_VAL_U(*(uint32_t *) elem_buf); break;
case sizeof(uint64_t): PRINT_VAL_U(*(uint64_t *) elem_buf); break;
default:
error_func_msg("Unexpected elem_size: %zu", elem_size);
return false;
}
return true;
}
bool
print_xint_array_member(struct tcb *tcp, void *elem_buf, size_t elem_size,
void *data)
{
switch (elem_size) {
case sizeof(uint8_t): PRINT_VAL_X(*(uint8_t *) elem_buf); break;
case sizeof(uint16_t): PRINT_VAL_X(*(uint16_t *) elem_buf); break;
case sizeof(uint32_t): PRINT_VAL_X(*(uint32_t *) elem_buf); break;
case sizeof(uint64_t): PRINT_VAL_X(*(uint64_t *) elem_buf); break;
default:
error_func_msg("Unexpected elem_size: %zu", elem_size);
return false;
}
return true;
}
bool
print_fd_array_member(struct tcb *tcp, void *elem_buf, size_t elem_size,
void *data)
{
printfd(tcp, *(int *) elem_buf);
return true;
}
/*
* Iteratively fetch and print up to nmemb elements of elem_size size
* from the array that starts at tracee's address start_addr.
*
* Array elements are being fetched to the address specified by elem_buf.
*
* The fetcher callback function specified by tfetch_mem_func should follow
* the same semantics as tfetch_mem function.
*
* The printer callback function specified by print_func is expected
* to print something; if it returns false, no more iterations will be made.
*
* The pointer specified by opaque_data is passed to each invocation
* of print_func callback function.
*
* This function prints:
* - "NULL", if start_addr is NULL;
* - "[]", if nmemb is 0;
* - start_addr, if nmemb * elem_size overflows or wraps around;
* - start_addr, if the first tfetch_mem_func invocation returned false;
* - elements of the array, delimited by ", ", with the array itself
* enclosed with [] brackets.
*
* If abbrev(tcp) is true, then
* - the maximum number of elements printed equals to max_strlen;
* - "..." is printed instead of max_strlen+1 element
* and no more iterations will be made.
*
* This function returns true only if tfetch_mem_func has returned true
* at least once.
*/
bool
print_array_ex(struct tcb *const tcp,
const kernel_ulong_t start_addr,
const size_t nmemb,
void *elem_buf,
const size_t elem_size,
tfetch_mem_fn tfetch_mem_func,
print_fn print_func,
void *const opaque_data,
unsigned int flags,
const struct xlat *index_xlat,
const char *index_dflt)
{
if (!start_addr) {
tprints("NULL");
return false;
}
if (!nmemb) {
tprint_array_begin();
if (flags & PAF_ARRAY_TRUNCATED)
tprint_more_data_follows();
tprint_array_end();
return false;
}
const size_t size = nmemb * elem_size;
const kernel_ulong_t end_addr = start_addr + size;
if (end_addr <= start_addr || size / elem_size != nmemb) {
if (tfetch_mem_func)
printaddr(start_addr);
else
tprint_unavailable();
return false;
}
const kernel_ulong_t abbrev_end =
(abbrev(tcp) && max_strlen < nmemb) ?
start_addr + elem_size * max_strlen : end_addr;
kernel_ulong_t cur;
kernel_ulong_t idx = 0;
enum xlat_style xlat_style = flags & XLAT_STYLE_MASK;
bool truncated = false;
for (cur = start_addr; cur < end_addr; cur += elem_size, idx++) {
if (cur != start_addr)
tprint_array_next();
if (tfetch_mem_func) {
if (!tfetch_mem_func(tcp, cur, elem_size, elem_buf)) {
if (cur == start_addr)
printaddr(cur);
else {
tprint_more_data_follows();
printaddr_comment(cur);
truncated = true;
}
break;
}
} else {
elem_buf = (void *) (uintptr_t) cur;
}
if (cur == start_addr)
tprint_array_begin();
if (cur >= abbrev_end) {
tprint_more_data_follows();
cur = end_addr;
truncated = true;
break;
}
if (flags & PAF_PRINT_INDICES) {
tprint_array_index_begin();
if (!index_xlat) {
print_xlat_ex(idx, NULL, xlat_style);
} else {
printxval_ex(index_xlat, idx, index_dflt,
xlat_style);
}
tprint_array_index_end();
}
if (!print_func(tcp, elem_buf, elem_size, opaque_data)) {
cur = end_addr;
break;
}
}
if ((cur != start_addr) || !tfetch_mem_func) {
if ((flags & PAF_ARRAY_TRUNCATED) && !truncated) {
if (cur != start_addr)
tprint_array_next();
tprint_more_data_follows();
}
tprint_array_end();
}
return cur >= end_addr;
}
int
printargs(struct tcb *tcp)
{
const unsigned int n = n_args(tcp);
for (unsigned int i = 0; i < n; ++i) {
if (i)
tprint_arg_next();
PRINT_VAL_X(tcp->u_arg[i]);
}
return RVAL_DECODED;
}
int
printargs_u(struct tcb *tcp)
{
const unsigned int n = n_args(tcp);
for (unsigned int i = 0; i < n; ++i) {
if (i)
tprint_arg_next();
PRINT_VAL_U((unsigned int) tcp->u_arg[i]);
}
return RVAL_DECODED;
}
int
printargs_d(struct tcb *tcp)
{
const unsigned int n = n_args(tcp);
for (unsigned int i = 0; i < n; ++i) {
if (i)
tprint_arg_next();
PRINT_VAL_D((int) tcp->u_arg[i]);
}
return RVAL_DECODED;
}
/* Print abnormal high bits of a kernel_ulong_t value. */
void
print_abnormal_hi(const kernel_ulong_t val)
{
if (current_klongsize > 4) {
const unsigned int hi = (unsigned int) ((uint64_t) val >> 32);
if (hi)
tprintf("%#x<<32|", hi);
}
}
int
read_int_from_file(const char *const fname, int *const pvalue)
{
const int fd = open_file(fname, O_RDONLY);
if (fd < 0)
return -1;
long lval;
char buf[sizeof(lval) * 3];
int n = read(fd, buf, sizeof(buf) - 1);
int saved_errno = errno;
close(fd);
if (n < 0) {
errno = saved_errno;
return -1;
}
buf[n] = '\0';
char *endptr = 0;
errno = 0;
lval = strtol(buf, &endptr, 10);
if (!endptr || (*endptr && '\n' != *endptr)
#if INT_MAX < LONG_MAX
|| lval > INT_MAX || lval < INT_MIN
#endif
|| ERANGE == errno) {
if (!errno)
errno = EINVAL;
return -1;
}
*pvalue = (int) lval;
return 0;
}