slstatus

status monitor
git clone git://git.suckless.org/slstatus
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run_command.c (501B)

      1 /* See LICENSE file for copyright and license details. */
      2 #include <stdio.h>
      3 #include <string.h>
      4 
      5 #include "../slstatus.h"
      6 #include "../util.h"
      7 
      8 const char *
      9 run_command(const char *cmd)
     10 {
     11 	char *p;
     12 	FILE *fp;
     13 
     14 	if (!(fp = popen(cmd, "r"))) {
     15 		warn("popen '%s':", cmd);
     16 		return NULL;
     17 	}
     18 
     19 	p = fgets(buf, sizeof(buf) - 1, fp);
     20 	if (pclose(fp) < 0) {
     21 		warn("pclose '%s':", cmd);
     22 		return NULL;
     23 	}
     24 	if (!p)
     25 		return NULL;
     26 
     27 	if ((p = strrchr(buf, '\n')))
     28 		p[0] = '\0';
     29 
     30 	return buf[0] ? buf : NULL;
     31 }