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Detach process with F_NOWAIT (#450)

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* Experimental PCRE library support

To compile with PCRE install libpcre-dev(el) and run:

cc  -Wall -Wextra -O3 -DPCRE -D_GNU_SOURCE -D_DEFAULT_SOURCE -I/usr/include/ncursesw -I/usr/include -o nnn src/nnn.c -lreadline -lncursesw -ltinfo -lpcre

* Detach process with F_NOWAIT

Co-authored-by: Mischievous Meerkat <engineerarun@gmail.com>
This commit is contained in:
KlzXS 2020-01-24 14:28:43 +01:00 committed by Mischievous Meerkat
parent 827875c3ef
commit 27617c0446
1 changed files with 27 additions and 10 deletions
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37
src/nnn.c
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@ -1279,6 +1279,7 @@ static int parseargs(char *line, char **argv)
static pid_t xfork(uchar flag) static pid_t xfork(uchar flag)
{ {
int status;
pid_t p = fork(); pid_t p = fork();
if (p > 0) { if (p > 0) {
@ -1286,16 +1287,37 @@ static pid_t xfork(uchar flag)
oldsighup = signal(SIGHUP, SIG_IGN); oldsighup = signal(SIGHUP, SIG_IGN);
oldsigtstp = signal(SIGTSTP, SIG_DFL); oldsigtstp = signal(SIGTSTP, SIG_DFL);
} else if (p == 0) { } else if (p == 0) {
/* We create a grandchild to detach */
if (flag & F_NOWAIT) {
p = fork();
if (p > 0)
exit(0);
else if (p == 0) {
signal(SIGHUP, SIG_DFL);
signal(SIGINT, SIG_DFL);
signal(SIGQUIT, SIG_DFL);
signal(SIGTSTP, SIG_DFL);
setsid();
return p;
}
perror("fork");
exit(0);
}
/* so they can be used to stop the child */ /* so they can be used to stop the child */
signal(SIGHUP, SIG_DFL); signal(SIGHUP, SIG_DFL);
signal(SIGINT, SIG_DFL); signal(SIGINT, SIG_DFL);
signal(SIGQUIT, SIG_DFL); signal(SIGQUIT, SIG_DFL);
signal(SIGTSTP, SIG_DFL); signal(SIGTSTP, SIG_DFL);
if (flag & F_NOWAIT)
setsid();
} }
/* This is the parent waiting for the child to create grandchild*/
if (flag & F_NOWAIT)
waitpid(p, &status, 0);
if (p == -1) if (p == -1)
perror("fork"); perror("fork");
return p; return p;
@ -1854,7 +1876,6 @@ static char xchartohex(char c)
static char * (*fnstrstr)(const char *haystack, const char *needle) = &strcasestr; static char * (*fnstrstr)(const char *haystack, const char *needle) = &strcasestr;
#ifdef PCRE #ifdef PCRE
static const unsigned char *tables;
static int pcreflags = PCRE_NO_AUTO_CAPTURE | PCRE_EXTENDED | PCRE_CASELESS; static int pcreflags = PCRE_NO_AUTO_CAPTURE | PCRE_EXTENDED | PCRE_CASELESS;
#else #else
static int regflags = REG_NOSUB | REG_EXTENDED | REG_ICASE; static int regflags = REG_NOSUB | REG_EXTENDED | REG_ICASE;
@ -1863,12 +1884,8 @@ static int regflags = REG_NOSUB | REG_EXTENDED | REG_ICASE;
#ifdef PCRE #ifdef PCRE
static int setfilter(pcre **pcrex, const char *filter) static int setfilter(pcre **pcrex, const char *filter)
{ {
const char *errstr = NULL; *pcrex = pcre_compile(filter, pcreflags, NULL, NULL, NULL);
int erroffset = 0; return *pcrex ? 0 : -1;
*pcrex = pcre_compile(filter, pcreflags, &errstr, &erroffset, tables);
return errstr ? -1 : 0;
} }
#else #else
static int setfilter(regex_t *regex, const char *filter) static int setfilter(regex_t *regex, const char *filter)