shithub: npe

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npe: add popen and pclose

--- a/include/npe/stdio.h

+++ b/include/npe/stdio.h

@@ -3,6 +3,8 @@

 #include <npe.h>

+FILE *popen(char *cmd, char *type);

+int pclose(FILE *s);

 int rename(char *old, char *new);

 #endif

--- a/libnpe/mkfile

+++ b/libnpe/mkfile

@@ -52,6 +52,8 @@

 	mkstemp.$O\

 	mktime.$O\

 	opendir.$O\

+	pclose.$O\

+	popen.$O\

 	readdir.$O\

 	realpath.$O\

 	rename.$O\

--- /dev/null

+++ b/libnpe/pclose.c

@@ -1,0 +1,7 @@

+#include <stdio.h>

+

+int

+pclose(FILE *s)

+{

+	return fclose(s);

+}

--- /dev/null

+++ b/libnpe/popen.c

@@ -1,0 +1,27 @@

+#include <stdio.h>

+

+FILE *

+popen(char *cmd, char *type)

+{

+	int p[2], r, null, pid;

+	FILE *s;

+

+	pipe(p);

+	r = type[0] == 'r' || type[1] == 'r';

+	if((pid = rfork(RFPROC|RFFDG|RFNOTEG|RFCENVG|RFNOWAIT)) == 0){

+		null = open("/dev/null", r ? OWRITE : OREAD);

+		dup(null, !r);

+		dup(p[r], r);

+		close(p[r]);

+		close(null);

+		execl("/bin/rc", "rc", "-c", cmd, nil);

+		sysfatal("popen: execl: %r");

+	}else if(pid < 0){

+		close(p[0]);

+		close(p[1]);

+		return nil;

+	}

+	s = fdopen(p[!r], r ? "r" : "w");

+	close(p[r]);

+	return s;

+}