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/* pending.c - reusable stuff awaiting review
*
* new lib entries for stuff in toys/pending
*/
#include "toys.h"
// Execute a callback for each PID that matches a process name from a list.
void for_each_pid_with_name_in(char **names, int (*callback)(pid_t pid, char *name))
{
DIR *dp;
struct dirent *entry;
char cmd[sizeof(toybuf)], path[64];
char **curname;
if (!(dp = opendir("/proc"))) perror_exit("opendir");
while ((entry = readdir(dp))) {
int fd, n;
if (!isdigit(*entry->d_name)) continue;
if (sizeof(path) <= snprintf(path, sizeof(path), "/proc/%s/cmdline",
entry->d_name)) continue;
if (-1 == (fd=open(path, O_RDONLY))) continue;
n = read(fd, cmd, sizeof(cmd));
close(fd);
if (n<1) continue;
for (curname = names; *curname; curname++)
if (!strcmp(basename(cmd), *curname))
if (!callback(atol(entry->d_name), *curname)) goto done;
}
done:
closedir(dp);
}
/*
* used to get the interger value.
*/
unsigned long get_int_value(const char *numstr, unsigned lowrange, unsigned highrange)
{
unsigned long rvalue = 0;
char *ptr;
if(*numstr == '-' || *numstr == '+' || isspace(*numstr)) perror_exit("invalid number '%s'", numstr);
errno = 0;
rvalue = strtoul(numstr, &ptr, 10);
if(errno || numstr == ptr) perror_exit("invalid number '%s'", numstr);
if(*ptr) perror_exit("invalid number '%s'", numstr);
if(rvalue >= lowrange && rvalue <= highrange) return rvalue;
else {
perror_exit("invalid number '%s'", numstr);
return rvalue; //Not reachable; to avoid waring message.
}
}
/*
* strcat to mallocated buffer
* reallocate if need be
*/
char *astrcat (char *x, char *y) {
char *z;
z = x;
x = realloc (x, (x ? strlen (x) : 0) + strlen (y) + 1);
if (!x) return 0;
(z ? strcat : strcpy) (x, y);
return x;
}
/*
* astrcat, but die on failure
*/
char *xastrcat (char *x, char *y) {
x = astrcat (x, y);
if (!x) error_exit ("xastrcat");
return x;
}
void daemonize(void)
{
int fd = open("/dev/null", O_RDWR);
if (fd < 0) fd = xcreate("/", O_RDONLY, 0666);
pid_t pid = fork();
if (pid < 0) perror_exit("DAEMON: failed to fork");
if (pid) exit(EXIT_SUCCESS);
setsid();
dup2(fd, 0);
dup2(fd, 1);
dup2(fd, 2);
if (fd > 2) close(fd);
}
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