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/*
* Test --syscall-limit option.
*
* Copyright (c) 2023 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "scno.h"
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#ifndef PRINT_VALID
# define PRINT_VALID 1
#endif
#ifndef PRINT_INVALID
# define PRINT_INVALID 1
#endif
#ifndef PRINT_STATS
# define PRINT_STATS 0
#endif
#ifndef UNLINKAT_CNT
# define UNLINKAT_CNT 1
#endif
#ifndef TOTAL_CNT
# define TOTAL_CNT 3
#endif
static int
write_status(const char *name, int value)
{
FILE *fp = fopen(name, "w");
if (!fp)
perror_msg_and_fail("fopen: %s", name);
if (fprintf(fp, "%d\n", value) <= 0)
perror_msg_and_fail("fprintf: %s", name);
if (fclose(fp))
perror_msg_and_fail("fclose: %s", name);
fflush(stdout);
return value;
}
static const char valid_path[] = ".";
static const char invalid_path[] = "invalid.dir";
static void
test_chdir(int pid, bool print)
{
if (chdir(valid_path))
perror_msg_and_fail("chdir: %s", valid_path);
if (print) {
#if PRINT_VALID
printf("%-5u chdir(\"%s\") = 0\n", pid, valid_path);
#else /* !PRINT_VALID */
if (chdir(invalid_path) == 0)
error_msg_and_fail("chdir: %s", invalid_path);
# if PRINT_INVALID
printf("%-5u chdir(\"%s\") = %s\n", pid, invalid_path, sprintrc(-1));
# endif
#endif /* PRINT_VALID */
} else {
if (chdir(invalid_path) == 0)
error_msg_and_fail("chdir: %s", invalid_path);
}
}
static void
test_rmdir(int pid, bool print)
{
#ifndef AT_FDCWD
# define AT_FDCWD -100
#endif
#ifndef AT_REMOVEDIR
# define AT_REMOVEDIR 0x200
#endif
if (syscall(__NR_unlinkat, AT_FDCWD, "invalid.dir", AT_REMOVEDIR) == 0)
error_msg_and_fail("unlinkat: %s", invalid_path);
#if PRINT_INVALID
if (print)
printf("%-5u unlinkat(AT_FDCWD, \"%s\", AT_REMOVEDIR) = %s\n",
pid, invalid_path, sprintrc(-1));
#endif
}
int
main(void)
{
int pid = getpid();
test_chdir(pid, /* print */ true);
fflush(stdout);
pid_t child = fork();
if (child < 0)
perror_msg_and_fail("fork");
if (child == 0) {
int pid = getpid();
test_rmdir(pid, /* print */ true);
test_chdir(pid, /* print */ true);
/*
* the tracer is expected to detach at this point
* if TOTAL_CNT < 4.
*/
test_rmdir(pid, /* print */ TOTAL_CNT > 3);
exit(0);
}
int status;
while ((waitpid(child, &status, 0)) != child) {
if (errno == EINTR)
continue;
perror_msg_and_fail("waitpid: %d", child);
}
/* the tracer is expected to detach at this point */
test_chdir(pid, /* print */ false);
#if PRINT_STATS
# if defined MPERS_IS_m32
printf("System call usage summary for 32 bit mode:\n");
# endif
# if defined MPERS_IS_mx32
printf("System call usage summary for x32 mode:\n");
# endif
printf("%9s %s\n", "calls", "syscall");
printf("--------- ----------------\n");
printf("%9d %s\n", 2, "chdir");
printf("%9d %s\n", UNLINKAT_CNT, "unlinkat");
printf("--------- ----------------\n");
printf("%9d %s\n", TOTAL_CNT, "total");
#endif /* PRINT_STATS */
return write_status("parent_status",
WIFEXITED(status) ? WEXITSTATUS(status) : 1);
}
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