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ce044d1791
This name better reflects that it handles arrays, and doesn't shout. Signed-off-by: Alejandro Colomar <alx@kernel.org>
76 lines
1.5 KiB
C
76 lines
1.5 KiB
C
// SPDX-FileCopyrightText: 2009, Nicolas François
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// SPDX-FileCopyrightText: 2023-2024, Alejandro Colomar <alx@kernel.org>
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// SPDX-License-Identifier: BSD-3-Clause
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#include "config.h"
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#include <limits.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "defines.h"
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#include "atoi/getnum.h"
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#include "defines.h"
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#include "prototypes.h"
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#include "string/sprintf/snprintf.h"
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#include "string/strerrno.h"
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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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int pidfd;
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struct stat st;
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dev_t proc_st_dev, proc_st_rdev;
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if (get_fd(pidfdstr, &pidfd) == -1)
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return -1;
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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(pidfd, &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 pidfd;
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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[PATH_MAX];
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pid_t target;
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if (get_pid(pidstr, &target) == -1)
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return -ENOENT;
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if (stprintf_a(proc_dir_name, "/proc/%d/", target) == -1) {
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fprintf(stderr, "snprintf of proc path failed for %d: %s\n",
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target, strerrno());
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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 %d: %s\n"),
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target, strerrno());
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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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