getpw_r.c
上传用户:sy_wanhua
上传日期:2013-07-25
资源大小:3048k
文件大小:2k
- #include <stddef.h>
- #include <string.h>
- #include <errno.h>
- #include <pwd.h>
- #include "pthread.h"
- static pthread_mutex_t getpw_mutex = PTHREAD_MUTEX_INITIALIZER;
- static int
- convert (struct passwd *ret, struct passwd *result,
- char *buf, int buflen)
- {
- int len;
- if (!buf) return -1;
- *result = *ret;
- result->pw_name = (char *) buf;
- /* This is the size. */
- len = strlen (ret->pw_name) + 1;
- if (len > buflen) return -1;
- buflen -= len;
- buf += len;
- strcpy (result->pw_name, ret->pw_name);
- result->pw_passwd = (char *) buf;
- /* This is the size. */
- len = strlen (ret->pw_passwd) + 1;
- if (len > buflen) return -1;
- buflen -= len;
- buf += len;
- strcpy (result->pw_passwd, ret->pw_passwd);
- result->pw_gecos = (char *) buf;
- /* This is the size. */
- len = strlen (ret->pw_gecos) + 1;
- if (len > buflen) return -1;
- buflen -= len;
- buf += len;
- strcpy (result->pw_gecos, ret->pw_gecos);
- result->pw_dir = (char *) buf;
- /* This is the size. */
- len = strlen (ret->pw_dir) + 1;
- if (len > buflen) return -1;
- buflen -= len;
- buf += len;
- strcpy (result->pw_dir, ret->pw_dir);
- result->pw_shell = (char *) buf;
- /* This is the size. */
- len = strlen (ret->pw_shell) + 1;
- if (len > buflen) return -1;
- buflen -= len;
- buf += len;
- strcpy (result->pw_shell, ret->pw_shell);
- return 0;
- }
- int getpwnam_r (const char *name, struct passwd *result,
- char *buffer, size_t buflen,
- struct passwd ** resptr)
- {
- struct passwd * p;
- int retval;
- pthread_mutex_lock (&getpw_mutex);
- p = getpwnam (name);
- if (p == NULL) {
- *resptr = NULL;
- retval = ESRCH;
- } else
- if (convert (p, result, buffer, buflen) != 0) {
- *resptr = NULL;
- retval = ERANGE;
- } else {
- *resptr = result;
- retval = 0;
- }
- pthread_mutex_unlock (&getpw_mutex);
- return retval;
- }
- int getpwuid_r (uid_t uid, struct passwd *result,
- char *buffer, size_t buflen,
- struct passwd ** resptr)
- {
- struct passwd * p;
- int retval;
- pthread_mutex_lock (&getpw_mutex);
- p = getpwuid (uid);
- if (p == NULL) {
- *resptr = NULL;
- retval = ESRCH;
- } else
- if (convert (p, result, buffer, buflen) != 0) {
- *resptr = NULL;
- retval = ERANGE;
- } else {
- *resptr = result;
- retval = 0;
- }
- pthread_mutex_unlock (&getpw_mutex);
- return retval;
- }