67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
#include <stdio.h>
|
|
#include <syscall.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <sys/stat.h>
|
|
|
|
extern char ** environ;
|
|
extern char * _argv_0;
|
|
extern int __libc_debug;
|
|
|
|
#define DEFAULT_PATH "/bin:/usr/bin"
|
|
|
|
int execve(const char *name, char * const argv[], char * const envp[]) {
|
|
if (__libc_debug) {
|
|
fprintf(stderr, "%s: execve(\"%s\"", _argv_0, name);
|
|
char * const* arg = argv;
|
|
while (*arg) {
|
|
fprintf(stderr,", \"%s\"", *arg);
|
|
arg++;
|
|
}
|
|
fprintf(stderr, ")\n");
|
|
}
|
|
__sets_errno(syscall_execve((char*)name,(char**)argv,(char**)envp));
|
|
}
|
|
|
|
int execvp(const char *file, char *const argv[]) {
|
|
if (file && (!strstr(file, "/"))) {
|
|
/* We don't quite understand "$PATH", so... */
|
|
char * path = getenv("PATH");
|
|
if (!path) {
|
|
path = DEFAULT_PATH;
|
|
}
|
|
char * xpath = strdup(path);
|
|
char * p, * last;
|
|
for ((p = strtok_r(xpath, ":", &last)); p; p = strtok_r(NULL, ":", &last)) {
|
|
int r;
|
|
struct stat stat_buf;
|
|
char * exe = malloc(strlen(p) + strlen(file) + 2);
|
|
strcpy(exe, p);
|
|
strcat(exe, "/");
|
|
strcat(exe, file);
|
|
|
|
r = stat(exe, &stat_buf);
|
|
if (r != 0) {
|
|
continue;
|
|
}
|
|
if (!(stat_buf.st_mode & 0111)) {
|
|
continue; /* XXX not technically correct; need to test perms */
|
|
}
|
|
|
|
return execve(exe, argv, environ);
|
|
}
|
|
free(xpath);
|
|
errno = ENOENT;
|
|
return -1;
|
|
} else if (file) {
|
|
return execve(file, argv, environ);
|
|
}
|
|
errno = ENOENT;
|
|
return -1;
|
|
}
|
|
|
|
int execv(const char * file, char * const argv[]) {
|
|
return execve(file, argv, environ);
|
|
}
|