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41 lines
1.3 KiB
Groff
41 lines
1.3 KiB
Groff
5 years ago
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.TH errmsg 7
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.SH NAME
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errmsg \- print diagnostics and/or abort program
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.SH SYNTAX
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.B #include <libowfat/errmsg.h>
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\fBerrmsg_iam\fP("my_program"); // or use argv[0]
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\fBmsg\fP("entering phase 1");
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\fBcarp\fP("there is a problem, but we'll soldier on");
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\fBdie\fP(111,"fatal problem, program will abort");
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\fBmsg\fP("failed to open ",filename," as expected");
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\fBcarpsys\fP("failed to open ",filename);
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\fBdiesys\fP(111,"error opening ",filename,", bailing out");
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.SH DESCRIPTION
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At the start of the program, call \fIerrmsg_iam\fP so the diagnostic messages
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will include the program name.
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\fImsg\fP will print to stdout (fd #1), \fIcarp\fP will print to stderr (fd #2), \fIdie\fP
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will print to stderr (fd #2) and then exit with the return code you
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specified.
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\fImsgsys\fP, \fIcarpsys\fP and \fIdiesys\fP will also include a string representation of
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the system error code in errno.
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By convention, fd #1 is for regular output and fd #2 is for error
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messages.
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These message are written directly to the corresponding file descriptor,
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without buffering. There is no need for flushing.
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.SH NOTE
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These functions do not synchronize with \fIbuffer_1\fP or \fIbuffer_2\fP.
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If you have pending output in a buffer, you need to flush manually first
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(see buffer_flush).
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.SH "SEE ALSO"
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buffer_flush(3)
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