mirror of https://github.com/proot-me/proot.git
39 lines
876 B
C
39 lines
876 B
C
#include <unistd.h> /* syscall(2), */
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#include <stdio.h> /* perror(3), fprintf(3), */
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#include <limits.h> /* PATH_MAX, */
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#include <stdlib.h> /* exit(3), */
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#include <strings.h> /* bzero(3), */
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#include <sys/syscall.h> /* SYS_readlink, */
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#include <fcntl.h> /* AT_FDCWD */
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int main(int argc, char *argv[])
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{
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char path[PATH_MAX];
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int status;
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bzero(path, sizeof(path));
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#if defined(SYS_readlink)
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status = syscall(SYS_readlink, "/proc/self/exe", path, PATH_MAX);
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#elif defined(SYS_readlinkat)
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status = syscall(SYS_readlinkat, AT_FDCWD, "/proc/self/exe", path, PATH_MAX);
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#else
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#error "SYS_readlink and SYS_readlinkat doesn't exists"
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#endif
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if (status < 0) {
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perror("readlink()");
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exit(EXIT_FAILURE);
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}
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if (status >= PATH_MAX)
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return 125;
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if (path[status] != '\0') {
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path[PATH_MAX - 1] = '\0';
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puts(path);
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exit(EXIT_FAILURE);
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}
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exit(EXIT_SUCCESS);
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}
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