C > Gnu-Linux sample source codes

 System uptime

System uptime #include <stdio.h> #include <string.h> #include <stdlib.h> int main(void) { FILE * uptimefile; char uptime_chr[28]; long uptime = 0; if((uptimefile = fopen("/proc/uptime", "r")) == NULL) perror("supt"), exit(EXIT_FAILURE); fgets(uptime_chr, 12, uptimefile); fclose(uptimefile); uptime = strtol(uptime_chr, NULL, 10); printf("System up for %ld seconds, %ld hours\n", uptime, uptime / 3600); exit(EXIT_SUCCESS); }



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