[Bug stdio/29016] New: popen() sets errno to ENOMEM when shell does not exist

["arnaud.lb at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29016

            Bug ID: 29016
           Summary: popen() sets errno to ENOMEM when shell does not exist
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: stdio
          Assignee: unassigned at sourceware dot org
          Reporter: arnaud.lb at gmail dot com
  Target Milestone: ---

Hi

I've found that popen() sets errno to ENOMEM when shell does not exist, and I'm
not sure whether it's expected or not by looking at the man page.

Here is a small reproducer:


```
// test.c

#include <stdio.h>
#include <errno.h>
#include <string.h>

int main() {
    errno = 0;
    FILE * f = popen("/true", "r");

    fprintf(stderr, "f: %p, errno: %d, strerror: %s\n", f, errno,
strerror(errno));
}
```

```
; gcc -static -o test test.c
; sudo chroot . /test
f: (nil), errno: 12, strerror: Cannot allocate memory
```

(Using chroot here to execute the program in an environment without /bin/sh)

>From the man page I can not tell whether this is expected or not.

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