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OS X undocumented __pthread_chdir() and __pthread_fchdir() syscalls
#include <stdio.h>
#include <stdlib.h>
#include <sys/syscall.h>
#include <unistd.h>
#include <fcntl.h>
#ifndef SYS___pthread_chdir
# define SYS___pthread_chdir 348
#ifndef SYS___pthread_fchdir
# define SYS___pthread_fchdir 349
int __pthread_chdir(const char *path)
return syscall(SYS___pthread_chdir, path);
int __pthread_fchdir(int dirfd)
return syscall(SYS___pthread_fchdir, dirfd);
int main(void)
int dirfd;
dirfd = open("/", O_RDONLY);
if (dirfd == -1)
perror("open"), exit(1);
if (__pthread_chdir("/"))
if (__pthread_fchdir(dirfd))
return 0;
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