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#include <sys/wait.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include "xlog.h"
/*
* Log system errors or error messages.
*/
void
syserror(char *message)
{
if (errno)
xlog(L_ERROR, "%s: errno %d (%s)", message, errno, strerror(errno));
else
xlog(L_ERROR, "Error: %s", message);
}
/*
* Log the the given argv[] if debugging is on.
*/
static void
show_argv(char *msg, char *const argv[])
{
char buf[BUFSIZ];
int i, cc=0;
if (!xlog_enabled(D_CALL))
return;
if (msg) {
sprintf(buf+cc, "%s ", msg);
cc = strlen(buf);
}
for (i=0; argv[i] != NULL && cc < BUFSIZ; i++) {
if ((cc + strlen(argv[i])) >= BUFSIZ)
break;
sprintf(buf+cc, "%s ", argv[i]);
cc = strlen(buf);
}
xlog(D_CALL, "%s", buf);
}
/*
* Execute the given command using the
* given argv as the arguments.
*/
int
execute_cmd(const char *cmd, char *const myargv[])
{
int pfd[2], status, cc;
pid_t pid;
char buf[BUFSIZ], *ch;
show_argv("executing:", myargv);
if (pipe(pfd) < 0) {
syserror("pipe() failed");
return errno;
}
switch((pid = fork())) {
case -1:
syserror("fork() failed");
break;
case 0: /* child */
close(pfd[0]);
if (dup2(pfd[1], STDOUT_FILENO) < 0)
perror("dup2(STDOUT_FILENO)");
if (dup2(pfd[1], STDERR_FILENO) < 0)
perror("dup2(STDERR_FILENO)");
close(pfd[1]);
execvp(cmd, myargv);
perror("execv");
_exit(255);
break;
default: /* parent */
status = 0;
close(pfd[1]);
if (waitpid(pid, &status, 0) < 0 && errno != ECHILD) {
syserror("waitpid() failed");
} else if (WIFEXITED(status)) {
cc = read(pfd[0], buf, BUFSIZ);
if (cc > 0) {
if ((ch = strrchr(buf, '\n')) != NULL)
*ch = '\0';
errno = 0;
syserror(buf);
}
close(pfd[0]);
}
break;
}
return errno;
}
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