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#include <unistd.h> /* syscall(2), */
#include <stdio.h> /* perror(3), fprintf(3), */
#include <limits.h> /* PATH_MAX, */
#include <stdlib.h> /* exit(3), */
#include <sys/syscall.h> /* SYS_readlink, */
#include <fcntl.h> /* AT_FDCWD */
int main(int argc, char *argv[])
{
char path[PATH_MAX];
int status;
if (argc != 2) {
fprintf(stderr, "usage: readlink FILE\n");
exit(EXIT_FAILURE);
}
#if defined(SYS_readlink)
status = syscall(SYS_readlink, argv[1], path, PATH_MAX);
#elif defined(SYS_readlinkat)
status = syscall(SYS_readlinkat, AT_FDCWD, argv[1], path, PATH_MAX);
#else
#error "SYS_readlink and SYS_readlinkat doesn't exists"
#endif
if (status < 0) {
perror("readlink()");
exit(EXIT_FAILURE);
}
path[status] = '\0';
puts(path);
exit(EXIT_SUCCESS);
}
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