cf9cc6963c
The variable declarations for the buffers have been aligned in this commit, so that they appear in the diff, making it easier to review. Some important but somewhat tangent changes included in this commit: - lib/nss.c: The size was being defined as 65, but then used as 64. That was a bug, although not an important one; we were just wasting one byte. Fix that while we replace snprintf() by SNPRINTF(), which will get the size from sizeof(), and thus will use the real size. Signed-off-by: Alejandro Colomar <alx@kernel.org>
103 lines
1.9 KiB
C
103 lines
1.9 KiB
C
/*
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* SPDX-FileCopyrightText: 2009 , Nicolas François
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <config.h>
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#ident "$Id$"
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#include "prototypes.h"
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#include "defines.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include "string/sprintf.h"
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int get_pid (const char *pidstr, pid_t *pid)
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{
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long long val;
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char *endptr;
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errno = 0;
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val = strtoll(pidstr, &endptr, 10);
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if ( ('\0' == *pidstr)
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|| ('\0' != *endptr)
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|| (0 != errno)
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|| (val < 1)
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|| (/*@+longintegral@*/val != (pid_t)val)/*@=longintegral@*/) {
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return 0;
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}
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*pid = val;
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return 1;
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}
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/*
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* If use passed in fd:4 as an argument, then return the
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* value '4', the fd to use.
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* On error, return -1.
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*/
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int get_pidfd_from_fd(const char *pidfdstr)
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{
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long long val;
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char *endptr;
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struct stat st;
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dev_t proc_st_dev, proc_st_rdev;
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errno = 0;
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val = strtoll(pidfdstr, &endptr, 10);
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if ( ('\0' == *pidfdstr)
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|| ('\0' != *endptr)
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|| (0 != errno)
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|| (val < 0)
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|| (/*@+longintegral@*/val != (int)val)/*@=longintegral@*/) {
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return -1;
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}
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if (stat("/proc/self/uid_map", &st) < 0) {
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return -1;
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}
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proc_st_dev = st.st_dev;
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proc_st_rdev = st.st_rdev;
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if (fstat(val, &st) < 0) {
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return -1;
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}
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if (st.st_dev != proc_st_dev || st.st_rdev != proc_st_rdev) {
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return -1;
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}
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return (int)val;
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}
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int open_pidfd(const char *pidstr)
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{
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int proc_dir_fd;
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char proc_dir_name[32];
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pid_t target;
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if (get_pid(pidstr, &target) == 0)
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return -ENOENT;
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/* max string length is 6 + 10 + 1 + 1 = 18, allocate 32 bytes */
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if (SNPRINTF(proc_dir_name, "/proc/%u/", target) == -1) {
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fprintf(stderr, "snprintf of proc path failed for %u: %s\n",
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target, strerror(errno));
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return -EINVAL;
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}
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proc_dir_fd = open(proc_dir_name, O_DIRECTORY);
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if (proc_dir_fd < 0) {
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fprintf(stderr, _("Could not open proc directory for target %u: %s\n"),
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target, strerror(errno));
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return -EINVAL;
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}
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return proc_dir_fd;
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}
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