Re: lug-bg: "C" wapros

[zimage@xxxxxxxxx (Theodor Milkov)]

Georgi Chorbadzhiyski wrote:

> Ako mozhe niakoi po svetnat da pomogne. Imam slednata programa
>
> #
> # funkciikata e orezana versia ot  pppd
> #
> int run_program(prog, args, must_exist, done, arg)
>     char *prog;
>     char **args;
>     int must_exist;
>     void (*done) __P((void *));
>     void *arg;
> {
>     int pid;
>
>     pid = fork();
>     if (pid == -1) {
>         log(L_ERR, "Failed to create child process for %s", prog);
>         return -1;
>     }
>     if (pid == 0) {
>         /* run the program */
>         execvp(prog, args);
>         if (must_exist || errno != ENOENT) {
>             /* have to reopen the log, there's nowhere else
>                for the message to go. */
>             log(L_ERR, "Can't execute: %s error: %u", prog, errno);
>         }
>         _exit(-1);
>     }
>     return pid;
> }
>
> wikam si funkciikata taka:
>
>     run_program("/usr/local/my_script", exec_buf, 0, NULL, NULL);
>
> /usr/local/my_script sadyrzha:
>
>     #!/bin/sh
>     echo raboti! >> /tmp/proba
>
> Wsichko ok obache, kato go wikna tova   run_program i waw log-a
> mi pishe:
>
>     can't execute: /usr/local/my_script error: 14
>
> kogato skript-a ne e izpalnim msg-to e:
>
>     can't execute: /usr/local/my_script error: 13
>
> Kakvo oznachavat tezi i greshki i kakvo sam obyrkal ??
>

Po printcip mojesh da polzvash systemnata biblioteka errno.h v koiato sa
definirani raznite greshki. Naprimer zameni:

            log(L_ERR, "Can't execute: %s error: %u", prog, errno);

as slednoto:

            log(L_ERR, "Can't execute: %s error: %s", prog,
sys_errlist[errno]);

Kato ne zabravish da #include <errno.h>. Togava vmesto 13 i 14 shte poluchish
saotvetno "Permission denied" i "Bad address"... dokolkoto "Bad
address" niakoi znae kakvo tochno znachi :-)

egards

==================================================================
A mail-list of Linux Users Group - Bulgaria (bulgarian linuxers)
Otpiswaneto RABOTI !!! : Majordomo@xxxxxxxxxxxxxxxxxx UNSUBSCRIBE LUG-BG
http://www.linux-bulgaria.org/ Hosted by Internet Group Ltd. - Stara Zagora