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