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