NeoMutt  2024-02-01-23-g345d7b
Teaching an old dog new tricks
DOXYGEN
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system.c
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1
30#include "config.h"
31#include <signal.h>
32#include <stdbool.h>
33#include <stdlib.h>
34#include <sys/wait.h> // IWYU pragma: keep
35#include <unistd.h>
36#include "mutt/lib.h"
37#include "imap/lib.h"
38#include "globals.h"
39#include "protos.h"
40
51int mutt_system(const char *cmd)
52{
53 int rc = -1;
54 struct sigaction act = { 0 };
55 struct sigaction oldtstp = { 0 };
56 struct sigaction oldcont = { 0 };
57 pid_t pid;
58
59 if (!cmd || (*cmd == '\0'))
60 return 0;
61
62 /* must ignore SIGINT and SIGQUIT */
63
65
66 act.sa_handler = SIG_DFL;
67/* we want to restart the waitpid() below */
68#ifdef SA_RESTART
69 act.sa_flags = SA_RESTART;
70#endif
71 sigemptyset(&act.sa_mask);
72 sigaction(SIGTSTP, &act, &oldtstp);
73 sigaction(SIGCONT, &act, &oldcont);
74
75 pid = fork();
76 if (pid == 0)
77 {
78 act.sa_flags = 0;
79
80 /* reset signals for the child; not really needed, but... */
82 act.sa_handler = SIG_DFL;
83 act.sa_flags = 0;
84 sigemptyset(&act.sa_mask);
85 sigaction(SIGTERM, &act, NULL);
86 sigaction(SIGTSTP, &act, NULL);
87 sigaction(SIGCONT, &act, NULL);
88
89 execle(EXEC_SHELL, "sh", "-c", cmd, NULL, EnvList);
90 _exit(127); /* execl error */
91 }
92 else if (pid != -1)
93 {
94 rc = imap_wait_keep_alive(pid);
95 }
96
97 sigaction(SIGCONT, &oldcont, NULL);
98 sigaction(SIGTSTP, &oldtstp, NULL);
99
100 /* reset SIGINT, SIGQUIT and SIGCHLD */
102
103 rc = (pid != -1) ? (WIFEXITED(rc) ? WEXITSTATUS(rc) : -1) : -1;
104
105 return rc;
106}
#define EXEC_SHELL
Definition: filter.h:28
char ** EnvList
Private copy of the environment variables.
Definition: globals.c:78
Global variables.
IMAP network mailbox.
int imap_wait_keep_alive(pid_t pid)
Wait for a process to change state.
Definition: util.c:979
Convenience wrapper for the library headers.
Prototypes for many functions.
void mutt_sig_block_system(void)
Block signals before calling exec()
Definition: signal.c:199
void mutt_sig_unblock_system(bool restore)
Restore previously blocked signals.
Definition: signal.c:223
int mutt_system(const char *cmd)
Run an external command.
Definition: system.c:51