mirror of
https://github.com/alsa-project/alsa-tools.git
synced 2025-11-03 09:01:51 -05:00
86 lines
1.9 KiB
C
86 lines
1.9 KiB
C
#include <sys/wait.h>
|
|
#include <signal.h>
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/types.h>
|
|
|
|
#ifndef MAX_PARAM
|
|
#define MAX_PARAM 10
|
|
#endif
|
|
|
|
/*
|
|
* start child process
|
|
*/
|
|
int new_process(char * const cmd_line[MAX_PARAM])
|
|
{
|
|
int proc_status;
|
|
pid_t pid;
|
|
pid_t w;
|
|
struct stat file_status;
|
|
|
|
/* memory for storage of function pointers from the signal handling routines */
|
|
void (*int_stat)();
|
|
void (*quit_stat)();
|
|
void (*usr2_stat)();
|
|
|
|
/*
|
|
* check command file
|
|
*/
|
|
|
|
/* search file */
|
|
if (stat(cmd_line[0], &file_status) < 0) {
|
|
fprintf(stderr, "Cannot find program '%s'.\n", cmd_line[0]);
|
|
fprintf(stderr, "You must specify path for '%s'.\n", cmd_line[0]);
|
|
return -errno;
|
|
}
|
|
|
|
proc_status = 0;
|
|
/* check file status and permissions */
|
|
if (file_status.st_mode & S_IFREG) {
|
|
if (!(file_status.st_mode & S_IXOTH)) {
|
|
if (!(file_status.st_mode & S_IXGRP)) {
|
|
if (!(file_status.st_mode & S_IXUSR)) {
|
|
proc_status = -EACCES;
|
|
} else if (file_status.st_uid != getuid()) {
|
|
proc_status = -EACCES;
|
|
}
|
|
} else if ((file_status.st_gid != getgid()) && (file_status.st_uid != getuid())) {
|
|
proc_status = -EACCES;
|
|
}
|
|
}
|
|
} else {
|
|
proc_status = -EACCES;
|
|
}
|
|
|
|
if (proc_status != 0) {
|
|
fprintf(stderr, "No permissions to execute program '%s'.\n", cmd_line[0]);
|
|
return proc_status;
|
|
}
|
|
|
|
if ( (pid = fork() ) == 0) {
|
|
execv(cmd_line[0], cmd_line);
|
|
}
|
|
|
|
/* for waiting ingnoring special interrupts */
|
|
|
|
int_stat = signal(SIGINT, SIG_IGN);
|
|
quit_stat = signal(SIGQUIT, SIG_IGN);
|
|
usr2_stat = signal(SIGUSR2, SIG_IGN);
|
|
|
|
/* waiting for the end of the child process */
|
|
|
|
while ( ( (w = wait(&proc_status)) != pid ) && (w != -1) )
|
|
;
|
|
if (w == -1) {
|
|
proc_status = -errno;
|
|
}
|
|
|
|
/* restore pointers from signal handling routines */
|
|
|
|
signal(SIGINT, int_stat);
|
|
signal(SIGQUIT, quit_stat);
|
|
signal(SIGUSR2, usr2_stat);
|
|
|
|
return proc_status;
|
|
}
|