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Copy pathutil.c
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110 lines (101 loc) · 2.99 KB
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#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "util.h"
void
cspawn(char *const *arg)
{
setsid();
execvp(arg[0], arg);
perror("cspawn - execvp");
_exit(127);
}
/* sigdsblocks from funcc */
void
csigself(int sig, int sigval)
{
union sigval sv;
sig += SIGRTMIN;
sv.sival_int = sigval;
if (sigqueue(pid, sig, sv) == -1) {
perror("csigself - sigqueue");
exit(1);
}
}
/* getcmdout doesn't null terminate cmdout
* make sure that terminal newline character is handled if the command spits one */
size_t
getcmdout(char *const *arg, char *cmdout, size_t cmdoutlen)
{
int fd[2];
size_t trd;
ssize_t rd;
if (pipe(fd) == -1) {
perror("getcmdout - pipe");
cleanup();
exit(1);
}
switch (fork()) {
case -1:
perror("getcmdout - fork");
close(fd[0]);
close(fd[1]);
cleanup();
exit(1);
case 0:
close(fd[0]);
if (fd[1] != STDOUT_FILENO) {
if (dup2(fd[1], STDOUT_FILENO) != STDOUT_FILENO) {
perror("getcmdout - child - dup2");
close(fd[1]);
exit(1);
}
close(fd[1]);
}
execvp(arg[0], arg);
perror("getcmdout - child - execvp");
_exit(127);
default:
close(fd[1]);
trd = 0;
do
rd = read(fd[0], cmdout + trd, cmdoutlen - trd);
while (rd > 0 && (trd += rd) < cmdoutlen);
if (rd == -1) {
perror("getcmdout - read");
cleanup();
close(fd[0]);
exit(1);
}
close(fd[0]);
}
return trd;
}
int
readint(const char *path, int *var) {
FILE *fp;
if (!(fp = fopen(path, "r")))
return 0;
if (fscanf(fp, "%d", var) != 1) {
fclose(fp);
return 0;
}
fclose(fp);
return 1;
}
void
uspawn(char *const *arg)
{
switch (fork()) {
case -1:
perror("uspawn - fork");
cleanup();
exit(1);
case 0:
setsid();
execvp(arg[0], arg);
perror("uspawn - child - execvp");
_exit(127);
}
}