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Functions pidfile_read() and pidfile_poll() now provied by libite.

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Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
This commit is contained in:
Joachim Nilsson
2015-07-09 03:24:20 +02:00
parent 8b8ddc43b5
commit 1db144c677
3 changed files with 1 additions and 79 deletions
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helpers.h
-3
View File
@@ -74,9 +74,6 @@ void runlevel_set (int pre, int now);
int runlevel_get (void);
char *runlevel_string (int levels);
pid_t pidfile_read (char *pidfile);
pid_t pidfile_poll (char *cmd, char *path);
int pid_alive (pid_t pid);
char *pid_get_name (pid_t pid, char *name, size_t len);
libite
+1 -1
Submodule libite updated: e4c5a0e77e...8db314623a
pid.c
-75
View File
@@ -31,81 +31,6 @@
#include "libite/lite.h"
/**
* pidfile_read - Reads a PID value from a pidfile.
* @pidfile: File containing PID, usually in /var/run/<PROC>.pid
*
* This function takes a @pidfile and returns the PID found therein.
*
* Returns:
* On invalid @pidfile -1 and @errno set to %EINVAL, when @pidfile does not exist -1
* and errno set to %ENOENT. When the pidfile is empty or when its contents cannot
* be translated this function returns zero (0), on success this function returns
* a PID value greater than one. PID 1 is reserved for the system init process.
*/
pid_t pidfile_read(char *pidfile)
{
pid_t pid = 0;
char buf[16];
FILE *fp;
if (!pidfile) {
errno = EINVAL;
return -1;
}
if (!fexist(pidfile))
return -1;
fp = fopen(pidfile, "r");
if (!fp)
return -1;
if (fgets(buf, sizeof(buf), fp)) {
errno = 0;
pid = (pid_t)strtol(buf, NULL, 10);
if (errno)
pid = 0; /* Failed conversion. */
}
fclose(fp);
return pid;
}
/**
* pidfile_poll - Poll for the existence of a pidfile and return PID
* @cmd: Process name, or command, called to expect a pidfile
* @path: Path to pidfile to poll for
*
* This function polls for the pidfile at @path for at most 5 seconds
* before timing out. If the file is created within that time span the
* file is read and its PID contents returned.
*
* Returns:
* The PID read from @path, or zero on timeout.
*/
pid_t pidfile_poll(char *cmd, char *path)
{
pid_t pid = 0;
int tries = 0;
/* Timeout = 100 * 50ms = 5s */
while (!fexist(path) && tries++ < 100) {
/* Wait 50ms between retries */
usleep(50000);
}
if (!fexist(path)) {
_e("Timeout! No PID found for %s, pidfile %s does not exist?", cmd, path);
pid = 0;
} else {
pid = pidfile_read(path);
}
return pid;
}
/**
* pid_alive - Check if a given process ID is running
* @pid: Process ID to check for.