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smtp-dummy: Prefer return rather than exit() in main.

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The main() function should be written as just another function with a
return value. This allows for more reliable code reuse. Imagine that
main() grows too large and needs to be factored into multiple
functions. At that point, exit() is probably the wrong thing, yet can
also be hard to notice as it's in less-frequently-tested exceptional
cases.
This commit is contained in:
Carl Worth 2011-06-21 14:54:10 -07:00
parent 41a094624a
commit b0ba84f9e7
1 changed files with 9 additions and 9 deletions
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18
test/smtp-dummy.c
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@ -127,7 +127,7 @@ main (int argc, char *argv[])
if (argc != 2) { if (argc != 2) {
fprintf (stderr, "Usage: %s <output-file>\n", argv[0]); fprintf (stderr, "Usage: %s <output-file>\n", argv[0]);
exit (1); return 1;
} }
output_filename = argv[1]; output_filename = argv[1];
@ -135,14 +135,14 @@ main (int argc, char *argv[])
if (output == NULL) { if (output == NULL) {
fprintf (stderr, "Failed to open %s for writing: %s\n", fprintf (stderr, "Failed to open %s for writing: %s\n",
output_filename, strerror (errno)); output_filename, strerror (errno));
exit (1); return 1;
} }
sock = socket (AF_INET, SOCK_STREAM, 0); sock = socket (AF_INET, SOCK_STREAM, 0);
if (sock == -1) { if (sock == -1) {
fprintf (stderr, "Error: socket() failed: %s\n", fprintf (stderr, "Error: socket() failed: %s\n",
strerror (errno)); strerror (errno));
exit (1); return 1;
} }
reuse = 1; reuse = 1;
@ -150,13 +150,13 @@ main (int argc, char *argv[])
if (err) { if (err) {
fprintf (stderr, "Error: setsockopt() failed: %s\n", fprintf (stderr, "Error: setsockopt() failed: %s\n",
strerror (errno)); strerror (errno));
exit (1); return 1;
} }
hostinfo = gethostbyname ("localhost"); hostinfo = gethostbyname ("localhost");
if (hostinfo == NULL) { if (hostinfo == NULL) {
fprintf (stderr, "Unknown host: localhost\n"); fprintf (stderr, "Unknown host: localhost\n");
exit (1); return 1;
} }
addr.sin_family = AF_INET; addr.sin_family = AF_INET;
@ -167,7 +167,7 @@ main (int argc, char *argv[])
fprintf (stderr, "Error: bind() failed: %s\n", fprintf (stderr, "Error: bind() failed: %s\n",
strerror (errno)); strerror (errno));
close (sock); close (sock);
exit (1); return 1;
} }
err = listen (sock, 1); err = listen (sock, 1);
@ -175,7 +175,7 @@ main (int argc, char *argv[])
fprintf (stderr, "Error: listen() failed: %s\n", fprintf (stderr, "Error: listen() failed: %s\n",
strerror (errno)); strerror (errno));
close (sock); close (sock);
exit (1); return 1;
} }
peer_addr_len = sizeof (peer_addr); peer_addr_len = sizeof (peer_addr);
@ -183,14 +183,14 @@ main (int argc, char *argv[])
if (peer == -1) { if (peer == -1) {
fprintf (stderr, "Error: accept() failed: %s\n", fprintf (stderr, "Error: accept() failed: %s\n",
strerror (errno)); strerror (errno));
exit (1); return 1;
} }
peer_file = fdopen (peer, "w+"); peer_file = fdopen (peer, "w+");
if (peer_file == NULL) { if (peer_file == NULL) {
fprintf (stderr, "Error: fdopen() failed: %s\n", fprintf (stderr, "Error: fdopen() failed: %s\n",
strerror (errno)); strerror (errno));
exit (1); return 1;
} }
do_smtp_to_file (peer_file, output); do_smtp_to_file (peer_file, output);