165 lines
3.0 KiB
C
165 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#define _GNU_SOURCE
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#include <errno.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <linux/types.h>
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#include <linux/wait.h>
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#include <sched.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syscall.h>
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#include <sys/mount.h>
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#include <sys/prctl.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include "pidfd.h"
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#include "../kselftest.h"
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static int safe_int(const char *numstr, int *converted)
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{
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char *err = NULL;
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long sli;
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errno = 0;
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sli = strtol(numstr, &err, 0);
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if (errno == ERANGE && (sli == LONG_MAX || sli == LONG_MIN))
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return -ERANGE;
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if (errno != 0 && sli == 0)
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return -EINVAL;
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if (err == numstr || *err != '\0')
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return -EINVAL;
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if (sli > INT_MAX || sli < INT_MIN)
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return -ERANGE;
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*converted = (int)sli;
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return 0;
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}
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static int char_left_gc(const char *buffer, size_t len)
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{
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size_t i;
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for (i = 0; i < len; i++) {
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if (buffer[i] == ' ' ||
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buffer[i] == '\t')
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continue;
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return i;
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}
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return 0;
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}
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static int char_right_gc(const char *buffer, size_t len)
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{
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int i;
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for (i = len - 1; i >= 0; i--) {
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if (buffer[i] == ' ' ||
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buffer[i] == '\t' ||
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buffer[i] == '\n' ||
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buffer[i] == '\0')
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continue;
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return i + 1;
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}
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return 0;
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}
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static char *trim_whitespace_in_place(char *buffer)
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{
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buffer += char_left_gc(buffer, strlen(buffer));
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buffer[char_right_gc(buffer, strlen(buffer))] = '\0';
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return buffer;
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}
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static pid_t get_pid_from_fdinfo_file(int pidfd, const char *key, size_t keylen)
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{
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int ret;
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char path[512];
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FILE *f;
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size_t n = 0;
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pid_t result = -1;
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char *line = NULL;
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snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", pidfd);
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f = fopen(path, "re");
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if (!f)
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return -1;
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while (getline(&line, &n, f) != -1) {
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char *numstr;
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if (strncmp(line, key, keylen))
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continue;
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numstr = trim_whitespace_in_place(line + 4);
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ret = safe_int(numstr, &result);
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if (ret < 0)
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goto out;
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break;
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}
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out:
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free(line);
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fclose(f);
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return result;
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}
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int main(int argc, char **argv)
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{
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int pidfd = -1, ret = 1;
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pid_t pid;
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ksft_set_plan(3);
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pidfd = sys_pidfd_open(-1, 0);
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if (pidfd >= 0) {
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ksft_print_msg(
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"%s - succeeded to open pidfd for invalid pid -1\n",
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strerror(errno));
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goto on_error;
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}
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ksft_test_result_pass("do not allow invalid pid test: passed\n");
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pidfd = sys_pidfd_open(getpid(), 1);
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if (pidfd >= 0) {
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ksft_print_msg(
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"%s - succeeded to open pidfd with invalid flag value specified\n",
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strerror(errno));
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goto on_error;
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}
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ksft_test_result_pass("do not allow invalid flag test: passed\n");
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pidfd = sys_pidfd_open(getpid(), 0);
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if (pidfd < 0) {
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ksft_print_msg("%s - failed to open pidfd\n", strerror(errno));
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goto on_error;
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}
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ksft_test_result_pass("open a new pidfd test: passed\n");
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pid = get_pid_from_fdinfo_file(pidfd, "Pid:", sizeof("Pid:") - 1);
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ksft_print_msg("pidfd %d refers to process with pid %d\n", pidfd, pid);
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ret = 0;
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on_error:
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if (pidfd >= 0)
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close(pidfd);
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return !ret ? ksft_exit_pass() : ksft_exit_fail();
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}
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