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135 lines
2.5 KiB
135 lines
2.5 KiB
/*
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* UCW Library -- Running of Commands
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*
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* (c) 2004 Martin Mares <mj@ucw.cz>
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*
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* This software may be freely distributed and used according to the terms
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* of the GNU Lesser General Public License.
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*/
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#include <ucw/lib.h>
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#include <ucw/process.h>
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#include <stdlib.h>
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#include <string.h>
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#include <alloca.h>
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#include <unistd.h>
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#include <sys/wait.h>
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void NONRET
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exec_command_v(const char *cmd, va_list args)
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{
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va_list cargs;
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va_copy(cargs, args);
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int cnt = 2;
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char *arg;
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while (arg = va_arg(cargs, char *))
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cnt++;
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va_end(cargs);
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char **argv = alloca(sizeof(char *) * cnt);
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argv[0] = (char *)cmd;
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cnt = 1;
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va_copy(cargs, args);
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while (arg = va_arg(cargs, char *))
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argv[cnt++] = arg;
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va_end(cargs);
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argv[cnt] = NULL;
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execv(cmd, argv);
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char echo[256];
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echo_command_v(echo, sizeof(echo), cmd, args);
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msg(L_ERROR, "Cannot execute %s: %m", echo);
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exit(255);
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}
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int
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run_command_v(const char *cmd, va_list args)
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{
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pid_t p = fork();
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if (p < 0)
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{
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msg(L_ERROR, "fork() failed: %m");
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return 0;
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}
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else if (!p)
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exec_command_v(cmd, args);
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else
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{
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int stat;
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char status_msg[EXIT_STATUS_MSG_SIZE];
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p = waitpid(p, &stat, 0);
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if (p < 0)
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die("waitpid() failed: %m");
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if (format_exit_status(status_msg, stat))
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{
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char echo[256];
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echo_command_v(echo, sizeof(echo), cmd, args);
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msg(L_ERROR, "`%s' failed: %s", echo, status_msg);
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return 0;
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}
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return 1;
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}
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}
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void
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echo_command_v(char *buf, int size, const char *cmd, va_list args)
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{
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char *limit = buf + size - 4;
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char *p = buf;
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const char *arg = cmd;
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do
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{
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int l = strlen(arg);
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if (p != buf && p < limit)
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*p++ = ' ';
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if (p+l > limit)
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{
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memcpy(p, arg, limit-p);
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strcpy(limit, "...");
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return;
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}
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memcpy(p, arg, l);
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p += l;
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}
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while (arg = va_arg(args, char *));
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*p = 0;
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}
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int
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run_command(const char *cmd, ...)
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{
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va_list args;
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va_start(args, cmd);
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int e = run_command_v(cmd, args);
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va_end(args);
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return e;
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}
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void NONRET
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exec_command(const char *cmd, ...)
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{
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va_list args;
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va_start(args, cmd);
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exec_command_v(cmd, args);
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}
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void
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echo_command(char *buf, int len, const char *cmd, ...)
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{
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va_list args;
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va_start(args, cmd);
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echo_command_v(buf, len, cmd, args);
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va_end(args);
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}
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#ifdef TEST
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int main(void)
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{
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char msg[1024];
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echo_command(msg, sizeof(msg), "/bin/echo", "datel", "strakapoud", NULL);
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msg(L_INFO, "Running <%s>", msg);
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run_command("/bin/echo", "datel", "strakapoud", NULL);
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return 0;
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}
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#endif
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