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// SPDX-FileCopyrightText: 2009, Nicolas François
// SPDX-FileCopyrightText: 2023-2024, Alejandro Colomar <alx@kernel.org>
// SPDX-License-Identifier: BSD-3-Clause
#include "config.h"
#include <limits.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "defines.h"
#include "atoi/getnum.h"
#include "defines.h"
#include "prototypes.h"
#include "string/sprintf/snprintf.h"
#include "string/strerrno.h"
/*
* If use passed in fd:4 as an argument, then return the
* value '4', the fd to use.
* On error, return -1.
*/
int get_pidfd_from_fd(const char *pidfdstr)
{
int pidfd;
struct stat st;
dev_t proc_st_dev, proc_st_rdev;
if (get_fd(pidfdstr, &pidfd) == -1)
return -1;
if (stat("/proc/self/uid_map", &st) < 0) {
return -1;
}
proc_st_dev = st.st_dev;
proc_st_rdev = st.st_rdev;
if (fstat(pidfd, &st) < 0) {
return -1;
}
if (st.st_dev != proc_st_dev || st.st_rdev != proc_st_rdev) {
return -1;
}
return pidfd;
}
int open_pidfd(const char *pidstr)
{
int proc_dir_fd;
char proc_dir_name[PATH_MAX];
pid_t target;
if (get_pid(pidstr, &target) == -1)
return -ENOENT;
if (stprintf_a(proc_dir_name, "/proc/%d/", target) == -1) {
fprintf(stderr, "snprintf of proc path failed for %d: %s\n",
target, strerrno());
return -EINVAL;
}
proc_dir_fd = open(proc_dir_name, O_DIRECTORY);
if (proc_dir_fd < 0) {
fprintf(stderr, _("Could not open proc directory for target %d: %s\n"),
target, strerrno());
return -EINVAL;
}
return proc_dir_fd;
}
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