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/* See LICENSE file for copyright and license details. */
#include "dwm.h"
void
fatal(char *fmt, ...) {
va_list args;
va_start(args, fmt);
vfprintf(stderr, fmt, args);
va_end(args);
if (fmt[0] && fmt[strlen(fmt)-1] == ':') {
fputc(' ', stderr);
perror(NULL);
} else {
fputc('\n', stderr);
}
exit(1);
}
void *
ecalloc(size_t nmemb, size_t size)
{
void *p;
if (!(p = calloc(nmemb, size)))
fatal("calloc:");
return p;
}
pid_t
getparentprocess(pid_t p)
{
uint v = 0;
#if defined(__linux__)
ioยทStream *f;
char buf[256];
snprintf(buf, sizeof(buf) - 1, "/proc/%u/stat", (unsigned)p);
if (!(f = fopen(buf, "r")))
return (pid_t)0;
if (fscanf(f, "%*u %*s %*c %u", (unsigned *)&v) != 1)
v = (pid_t)0;
fclose(f);
#elif defined(__FreeBSD__)
struct kinfo_proc *proc = kinfo_getproc(p);
if (!proc)
return (pid_t)0;
v = proc->ki_ppid;
free(proc);
#endif
return (pid_t)v;
}
int
isdescendent(pid_t p, pid_t c)
{
while (p != c && c != 0)
c = getparentprocess(c);
return (int)c;
}
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