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Use macros for flags to spawn()

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Arun Prakash Jana 2017-06-20 21:29:37 +05:30
parent 5ea4eb0816
commit 3da053cbfa
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GPG key ID: A75979F35C080412
1 changed files with 25 additions and 23 deletions
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48
nnn.c
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@ -106,6 +106,14 @@ static void disabledbg()
#define FILTER '/'
#define MAX_BM 10
/* Macros to define process spawn behaviour as flags */
#define SP_NONE 0x00 /* no flag set */
#define SP_MARKER 0x01 /* draw marker to indicate nnn spawned (e.g. shell) */
#define SP_NOWAIT 0x02 /* don't wait for child process (e.g. file manager) */
#define SP_NOTRACE 0x04 /* suppress stdout and strerr (no traces) */
#define SP_SIGINT 0x08 /* restore default SIGINT handler */
#define SP_NORMAL 0x80 /* spawn child process in non-curses regular mode */
typedef unsigned long ulong;
typedef unsigned char uchar;
@ -378,14 +386,8 @@ exitcurses(void)
}
/*
* Spawns a child process. Behaviour can be controlled using flag:
* Limited to 2 arguments to a program
* flag works on bit set:
* - 0b1: draw a marker to indicate nnn spawned e.g., a shell
* - 0b10: do not wait in parent for child process e.g. DE file manager
* - 0b100: suppress stdout and stderr
* - 0b1000: restore default SIGINT handler
* - 0b10000000: exit curses mode
* Spawns a child process. Behaviour can be controlled using flag.
* Limited to 2 arguments to a program, flag works on bit set.
*/
static void
spawn(char *file, char *arg1, char *arg2, char *dir, uchar flag)
@ -393,7 +395,7 @@ spawn(char *file, char *arg1, char *arg2, char *dir, uchar flag)
pid_t pid;
int status;
if (flag & 0b10000000)
if (flag & SP_NORMAL)
exitcurses();
pid = fork();
@ -402,11 +404,11 @@ spawn(char *file, char *arg1, char *arg2, char *dir, uchar flag)
status = chdir(dir);
/* Show a marker (to indicate nnn spawned shell) */
if (flag & 0b1)
if (flag & SP_MARKER)
printf("\n +-++-++-+\n | n n n |\n +-++-++-+\n\n");
/* Suppress stdout and stderr */
if (flag & 0b100) {
if (flag & SP_NOTRACE) {
int fd = open("/dev/null", O_WRONLY, 0200);
dup2(fd, 1);
@ -414,18 +416,18 @@ spawn(char *file, char *arg1, char *arg2, char *dir, uchar flag)
close(fd);
}
if (flag & 0b1000)
if (flag & SP_SIGINT)
signal(SIGINT, SIG_DFL);
execlp(file, file, arg1, arg2, NULL);
_exit(1);
} else {
if (!(flag & 0b10))
if (!(flag & SP_NOWAIT))
/* Ignore interruptions */
while (waitpid(pid, &status, 0) == -1)
DPRINTF_D(status);
DPRINTF_D(pid);
if (flag & 0b10000000)
if (flag & SP_NORMAL)
initcurses();
}
}
@ -1809,7 +1811,7 @@ nochange:
mime = getmime(dents[cur].name);
if (mime) {
spawn(editor, newpath, NULL,
NULL, 0b10000000);
NULL, SP_NORMAL);
continue;
}
@ -1823,13 +1825,13 @@ nochange:
if (strstr(g_buf, "text/") == g_buf) {
spawn(editor, newpath, NULL,
NULL, 0b10000000);
NULL, SP_NORMAL);
continue;
}
}
/* Invoke desktop opener as last resort */
spawn(utils[0], newpath, NULL, NULL, 0b100);
spawn(utils[0], newpath, NULL, NULL, SP_NOTRACE);
continue;
}
default:
@ -1853,7 +1855,7 @@ nochange:
printmsg("navigate-as-you-type off");
goto nochange;
case SEL_SEARCH:
spawn(player, path, "search", NULL, 0b10000000);
spawn(player, path, "search", NULL, SP_NORMAL);
break;
case SEL_NEXT:
if (cur < ndents - 1)
@ -2216,7 +2218,7 @@ nochange:
goto nochange;
}
spawn(desktop_manager, path, NULL, path, 0b110);
spawn(desktop_manager, path, NULL, path, SP_NOTRACE | SP_NOWAIT);
break;
case SEL_FSIZE:
cfg.sizeorder ^= 1;
@ -2263,7 +2265,7 @@ nochange:
else
snprintf(newpath, PATH_MAX, "%s/%s",
path, dents[cur].name);
spawn(copier, newpath, NULL, NULL, 0b0);
spawn(copier, newpath, NULL, NULL, SP_NONE);
printmsg(newpath);
} else if (!copier)
printmsg("NNN_COPIER is not set");
@ -2273,18 +2275,18 @@ nochange:
break;
case SEL_RUN:
run = xgetenv(env, run);
spawn(run, NULL, NULL, path, 0b10000001);
spawn(run, NULL, NULL, path, SP_NORMAL | SP_MARKER);
/* Repopulate as directory content may have changed */
goto begin;
case SEL_RUNARG:
run = xgetenv(env, run);
spawn(run, dents[cur].name, NULL, path, 0b10000000);
spawn(run, dents[cur].name, NULL, path, SP_NORMAL);
break;
}
/* Screensaver */
if (idletimeout != 0 && idle == idletimeout) {
idle = 0;
spawn(player, "", "screensaver", NULL, 0b10001000);
spawn(player, "", "screensaver", NULL, SP_NORMAL | SP_SIGINT);
}
}
}